1. Решите уравнения

Для решения линейных уравнений перенесем слагаемые с переменной $x$ в одну сторону, а свободные члены (числа) в другую, меняя их знак на противоположный: 1) $4x - 3x = 6 - 5 \Rightarrow x = 1$ 2) $5x - 3x = 1 + 3 \Rightarrow 2x = 4 \Rightarrow x = 2$ 3) $2x - x = -5 + 8 \Rightarrow x = 3$ 4) $9 - 1 = x + 3x \Rightarrow 8 = 4x \Rightarrow x = 2$ 5) $6x - 3x = 8 + 7 \Rightarrow 3x = 15 \Rightarrow x = 5$ 6) $4x - 2x = 10 + 2 \Rightarrow 2x = 12 \Rightarrow x = 6$ 7) $6x - 4x = 17 - 3 \Rightarrow 2x = 14 \Rightarrow x = 7$ 8) $9x - 8x = 7 + 1 \Rightarrow x = 8$ 9) $4x - 2x = 12 + 6 \Rightarrow 2x = 18 \Rightarrow x = 9$ 10) $3x - 2x = 13 - 3 \Rightarrow x = 10$ 11) $4x - 3x = 20 - 9 \Rightarrow x = 11$ 12) $7x - 5x = 23 + 1 \Rightarrow 2x = 24 \Rightarrow x = 12$ 13) $5x - 3x = 28 - 2 \Rightarrow 2x = 26 \Rightarrow x = 13$ 14) $6x - 5x = 17 - 3 \Rightarrow x = 14$ 15) $8x - 6x = 20 + 10 \Rightarrow 2x = 30 \Rightarrow x = 15$ 16) $17x - 16x = 15 + 1 \Rightarrow x = 16$ 17) $3x - 5x = -15 - 19 \Rightarrow -2x = -34 \Rightarrow x = 17$ 18) $2x - 4x = -30 - 6 \Rightarrow -2x = -36 \Rightarrow x = 18$ 19) $5x - 4x = 22 - 3 \Rightarrow x = 19$ 20) $2x - x = 24 - 2 \Rightarrow x = 22$ 21) $7x - 6x = 26 - 5 \Rightarrow x = 21$