Răspuns:

Explicație pas cu pas:

a)

3[2 + 3(x - 1)] = 5(2x + 1)

3(2 + 3x - 3) = 10x + 5

3(3x - 1) = 10x + 5

9x - 3 = 10x + 5

10x - 9x = -3 - 5

x = -8

b)

2 - [5(2x - 1) - 2x] = 11x

2 - (10x - 5 - 2x) = 11x

2 - (8x - 5) = 11x

2 - 8x + 5 = 11x

7 = 11x + 8x = 19x

x = 7/19

c)

3(6x - 2 - 6x + 9 + 2x) - 30x - 25 = 3(2x + 8 - 15) - 29x

3(2x + 7) - 30x - 25 = 3(2x - 7) - 29x

6x + 21 - 30x - 25 = 6x - 21 - 29x

-24x - 4 = -21 - 23x

24x - 23x = 21 - 4

x = 17