615. Найдите корень уравнения 8x - 5 = 10x.

Для решения линейных уравнений перенесем слагаемые с переменной $x$ в одну сторону, а свободные числа — в другую, меняя знаки на противоположные. 615. $8x - 5 = 10x \Rightarrow 8x - 10x = 5 \Rightarrow -2x = 5 \Rightarrow x = -2,5$ 616. $6x = x - 2 \Rightarrow 6x - x = -2 \Rightarrow 5x = -2 \Rightarrow x = -0,4$ 617. $9x - 4 = 10x \Rightarrow 9x - 10x = 4 \Rightarrow -x = 4 \Rightarrow x = -4$ 618. $5x - 3 = -10x \Rightarrow 5x + 10x = 3 \Rightarrow 15x = 3 \Rightarrow x = 0,2$ 619. $x + 9 = -9x \Rightarrow x + 9x = -9 \Rightarrow 10x = -9 \Rightarrow x = -0,9$ 620. $3x - 8 = -x \Rightarrow 3x + x = 8 \Rightarrow 4x = 8 \Rightarrow x = 2$ 621. $2x + 7 = -2x \Rightarrow 2x + 2x = -7 \Rightarrow 4x = -7 \Rightarrow x = -1,75$ 622. $-5x = 5x - 6 \Rightarrow -5x - 5x = -6 \Rightarrow -10x = -6 \Rightarrow x = 0,6$ 623. $-x - 2 = 9x \Rightarrow -x - 9x = 2 \Rightarrow -10x = 2 \Rightarrow x = -0,2$ 624. $-6x - 5 = 4x \Rightarrow -6x - 4x = 5 \Rightarrow -10x = 5 \Rightarrow x = -0,5$ 625. $-x + 7 = 6x \Rightarrow -x - 6x = -7 \Rightarrow -7x = -7 \Rightarrow x = 1$ 626. $-7x + 8 = 9x \Rightarrow -7x - 9x = -8 \Rightarrow -16x = -8 \Rightarrow x = 0,5$ 627. $-x + 2 = 4x \Rightarrow -x - 4x = -2 \Rightarrow -5x = -2 \Rightarrow x = 0,4$ 628. $-9x - 8 = -8x \Rightarrow -9x + 8x = 8 \Rightarrow -x = 8 \Rightarrow x = -8$ 629. $-x - 7 = -5x \Rightarrow -x + 5x = 7 \Rightarrow 4x = 7 \Rightarrow x = 1,75$ 630. $-5x + 2 = -10x \Rightarrow -5x + 10x = -2 \Rightarrow 5x = -2 \Rightarrow x = -0,4$ 631. $-2x + 3 = -8x \Rightarrow -2x + 8x = -3 \Rightarrow 6x = -3 \Rightarrow x = -0,5$ 632. $-4x = -10x - 9 \Rightarrow -4x + 10x = -9 \Rightarrow 6x = -9 \Rightarrow x = -1,5$ 633. $6 + 3x = 4x - 1 \Rightarrow 3x - 4x = -1 - 6 \Rightarrow -x = -7 \Rightarrow x = 7$ 634. $-1 + 2x = 10x + 3 \Rightarrow 2x - 10x = 3 + 1 \Rightarrow -8x = 4 \Rightarrow x = -0,5$ 635. $-4 + 3x = 8x + 5 \Rightarrow 3x - 8x = 5 + 4 \Rightarrow -5x = 9 \Rightarrow x = -1,8$ 636. $9 + 4x = 8x - 9 \Rightarrow 4x - 8x = -9 - 9 \Rightarrow -4x = -18 \Rightarrow x = 4,5$ 637. $2 + 8x = 3x + 9 \Rightarrow 8x - 3x = 9 - 2 \Rightarrow 5x = 7 \Rightarrow x = 1,4$ 638. $6 - 2x = 3x - 10 \Rightarrow -2x - 3x = -10 - 6 \Rightarrow -5x = -16 \Rightarrow x = 3,2$ 639. $5 - 2x = 8x + 9 \Rightarrow -2x - 8x = 9 - 5 \Rightarrow -10x = 4 \Rightarrow x = -0,4$