Question

помогите пожалцйста , как решать
1) 2(x+6) - 3(2x-7) =29
2) 3(3t-4) + 4(6-t)=18
3) 5(8-5b) - 6(4-3b) =16
4) 7(2v+1) - 3(9v+2)=40

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Answer 1

Ответ:

Пошаговое объяснение:

1) 2(x+6) - 3(2x-7) =29

2х + 12 - 6х + 21 = 29

-4х = 29 - 33

-4х = - 4

х = 1

2) 3(3t-4) + 4(6-t)=18

9t - 12 + 24 - 4t = 18

5t = 18 + 12

5t = 30

t = 30 : 5

t = 6

3) 5(8-5b) - 6(4-3b) =16

40 - 25b - 24 + 18b = 16

-7b = 16 -16

-7b = 0

b = 0

4) 7(2v+1) - 3(9v+2)=40

14v + 7 - 27v - 6 = 40

-13v = 40 -1

-13v = 39

v = 39 : ( -13)

v = -3