Réponse :
Bonjour,
a.
-2 + x = 5
x = 5 + 2
x = 7
b.
-5x = 24
-x = 24/5
-x = 4.8
x = -4.8
c.
-2x + 5x = 36
3x = 36
x = 36/3
x = 12
d.
x + 9 = 16
x = 16 - 9
x = 7
e.
6x = 15
x = 15/6
x = 2.5
f.
4x + 3x = 49
7x = 49
x = 49/7
x = 7
J'espère avoir pu vous aider