Réponse :
Bonjour
Explications étape par étape :
Je peux te le faire .
exercice 42
a) 2x -3 = 4 + x
2x -x = 3 +4
x = 7
b) y + 4 = -4 -3y
y + 3y = -4 -4
4y = -8
y = -8/4
y = -2
Exercice 43
7x -6 = 4 -3x
7x +3x = +6 +4
10x = 10
x = 10/10
x = 1
12 -a = 18 -3a
-a + 3a = -12 + 18
2a = +6
a = 6/2
a = 3
Exercice 44
-t -4 = 8 + 7t
-t -7t = +4 +8
-8t = 12
t = - 12/8
t = -6/4 = -3/2
13x + 11 = 8x + 28
13x -8x = -11 + 28
5x = +17
x = 17/5
Exercice 45
5x = 0
x = 0
7y + 22 = 14 -4y
7y + 4y = -22 + 14
11y = -8
y = -8/11
