bonjour
( 2 x + 5 ) /2 = 5 ( 2 x - 3 )
( 2 x + 5 ) / 2 = 10 x - 15
( 2 x + 5 ) / 2 = ( 20 x - 30 ) / 2
2 x + 5 = 20 x - 30
2 x - 20 x = - 30 - 5
- 18 x = - 35
x = 35/18
4 - 3 c = 2 + 7 c /3
12/3 - 9 c /3 = 6 /3 + 7 c /3
- 9 c - 7 c = 6 - 12
- 16 c = - 6
c = 6/16 = 3/4
x² = x² + 2 + 1
x² - x² = 3
0 x = 3 donc pas de solution
