Réponse :
bonjour
Explications étape par étape :
a)
5x - 7 = 8
5x = 8 + 7
5x = 15
x = 15/5
x = 3
b)
- 2 = 18 + 10y
10y = - 2 - 18
10y = - 20
y = - 20/10
y = - 2
c)
7 + 9y = - 29
9y = - 29 - 7
9y = - 36
y = - 36/9
y = - 4
d)
3(x - 1) = 3
3x - 3 = 3
3x = 3 + 3
3x = 6
x = 6/3
x = 2
e)
12 - 6x = 3/2
2(12 - 6x) = 3
24 - 12x = 3
- 12x = 3 - 24
- 12x = - 21
12x = 21
x = 21/12
x = 7/4
f)
5x/3 + 1/5 = 2x/3 - 1/5
5x/3 - 2x/3 = -1/5 - 1/5
3x/3 = -2 /5
x = - 2/5
bonne journée
