Вопрос:

147. 7 - 5(x + 3) = 2.

Фотография

Ответ ассистента

147. 7 - 5(x + 3) = 2 7 - 5x - 15 = 2 -5x - 8 = 2 -5x = 10 x = -2 148. 4(x + 11) + 8 = -21 4x + 44 + 8 = -21 4x + 52 = -21 4x = -73 x = -18,25 149. 4x - (7 - x) = -12 4x - 7 + x = -12 5x - 7 = -12 5x = -5 x = -1 150. 3(x - 1) + x = 17 3x - 3 + x = 17 4x - 3 = 17 4x = 20 x = 5 151. 2(x + 7) + 3(x - 1) = -18 2x + 14 + 3x - 3 = -18 5x + 11 = -18 5x = -29 x = -5,8 152. 7(x - 2) + 3(x + 8) - 1 = 0 7x - 14 + 3x + 24 - 1 = 0 10x + 9 = 0 10x = -9 x = -0,9 153. 13 - 2(x + 5) + 3(x - 2) = 0 13 - 2x - 10 + 3x - 6 = 0 x - 3 = 0 x = 3 154. 7(2x - 1) - 5(2x + 7) = -2 14x - 7 - 10x - 35 = -2 4x - 42 = -2 4x = 40 x = 10 155. 5x - 2(x + 13) = 2(x - 3) 5x - 2x - 26 = 2x - 6 3x - 26 = 2x - 6 3x - 2x = 26 - 6 x = 20

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