Equations: a. (4x - 1) - (2 - 3x) = 3x - 5(2 - x) + 1 b. 3 (x - 2/7) - 2/3x = 5 ( 1/6x - 1) merci de votre aide

Bonsoir,

Equations:

a. (4x - 1) - (2 - 3x) = 3x - 5(2 - x) + 1

4x - 1 - 2 + 3x = 3x - 10 + 5x + 1

7x - 3 = 8x - 9

7x - 3 - 7x = 8x - 9 - 7x

-3 + 9 = x -9 + 9

6 = x

x = 6

b. 3 (x - 2/7) - 2/3x = 5 ( 1/6x - 1)

3x - 6/7 - 2/3 x = 5/6 x - 5

9/3 x - 2/3 x - 5/6 x = 6/7 - 5

7/3 x - 5/6 x = 6/7 - 35/7

14/6 x - 5/6 x = -29/7

9/6 x = -29/7

3/2 x = -29/7

x = -29/7 * 2/3

x = -58/21