Sagot :
Réponse :
a) 3x=15
3x=15
x= 15/3=5
b) x+3=12
x= 12-3=9
c) x +3 = 12
x=12-3=9
d) -4x = 32
x= -32/4=-8
e) 5x -3 = 2x + 6
5x-2x=6+3
3x=9
x=9/3 = 3
f) 3x + 1 = 2x+ 11 x
3x-2x-11x=-1
-10x=-1
x=1:10
Explications étape par étape
bonsoir
3 x = 15
x = 15/3 = 5
x + 3 = 12
x = 12 - 3
x = 9
x + 3 = 12 x
x - 12 x = - 3
- 11 x = - 3
x = 3 /11
- 4 x = 32
x = - 32/4 = - 8
5 x - 3 = 2 x + 6 x
5 x - 2 x- 6 x = 3
- 3 x = 3
x = - 1
3 x + 1 = 2 x + 11 x
3 x - 2 x - 11 x = - 1
- 10 x = - 1
x = 1/10