Réponse :
a) 8 x - 10 = x
8 x - x = 10
7 x = 10
x = 10/7
b ) 2 x + 16 + 3 = 4 - 3 x
2 x + 3 x = 4 - 19
5 x = - 1 5
x = - 3
c ) 12 x - 1 = 10 x - 4 + 1
12 x - 10 x = - 4 + 1 + 1
2 x = - 2
x = - 1
d ) ( x - 3 ) ² = x ( x - 5 )
x² - 6 x + 9 = x² -5 x
x² - x² - 6 x + 5 x = - 9
- x = - 9
x = 9