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Ответ:

Пошаговое объяснение:

a)

2(3 - x) + 7x = 4 - (3x + 2)

6 - 2x + 7x = 4 - 3x - 2

6 + 5x = 2 - 3x

5x + 3x = 2 - 6

8x = -4

x = -4 : 8

x = -0,5

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x/3 + (x - 1)/5 = 1 |*15

5x + 3(x - 1) = 1*15

5x + 3x - 3 = 15

8x - 3 = 15

8x = 15+3

8x = 18

x = 18 : 8

x = 2,25