Explications étape par étape
b. 3x - 1 / 7 = 6 / 1
1 * ( 3x - 1 ) = 6 * 7
3x - 1 = 42
3x = 43
x = 43/3
d. 5 + 8x = 11 + 10x
5 = 11 + 2x
- 6 = 2x
x = - 6/2 = - 3/1 = - 3
f. 3 ( 2x - 5 ) - ( 7 - 4x ) = 0
6x - 15 - 7 + 4x = 0
10x - 22 = 0
10x = 22
x = 22/10 = 2,2
