bonjour
2 ( x +5) -5 ( 3 x + 7) = 4
2 x + 10 - 15 x - 35 = 4
- 13 x = 4 - 10 + 35
- 13 x = 29
x = - 29/13
(3 x - 8 )/ 5 = ( 3 - 7 x) / 4
= (12 x - 32)/20 = (15 - 35 x)/20
12 x - 32 = 15 - 35 x
12 x + 35 x = 15 + 32
47 x = 47
x = 1
10 x - 45 = 6 x - 24
10 x - 3 x = - 24 + 45
7 x = 21
x = 21/7 = 3