bonjour
2 x - 4 = 7
2 x = 7 + 4
2 x = 11
x = 11/2
( 3 x + 6 ) ( x - 7 ) = 0
x = - 2 ou 7
( 2 x + 1 ) / ( x + 10 ) = 0 avec x ≠ - 10
x = - 1/2
√x = 15
x = 15² = 225
1/x = 8
8 x = 1
x = 1 /8
x² = 10
x = √10 ou - √10