Réponse :
Explications étape par étape
1) 5x=-12 <=> x= -12/5
2) 5 - 3x = -15 <=> 3x = 15 + 5
<=> 3x = 20
<=> x = 20/3
3) 7x - 4 = 5x + 6 <=> 7x -5x = 6 +4
<=> 2x = 10
<=> x = 10/2
<=> x =5
4) 4-(3x + 1) = 3(x+5) <=> 4 -3x - 1 = 3x + 15
<=> 3x + 3x = 4 -1 -15
<=> 6x = -12
<=> x = -2
j'espère avoir aidé.
