Exercice 2
A = 4x+8
B= -12r+18
C= x^2+9x+18
E= 12x^2+13x-45
D= 33x+12
Exercice 3
a) 2x9+17=94-5x9
14
b) 2x11+17=94-5x11
0
Exercice 4
A) 3r=72
r=72/3
r=24
B)x+17=10
x=10-17
x=-7
C)6r-13=5
6r=13+5
6r=18
r=18/6
r=3
D)12+9x=4x-28
9x-4x=-28-12
5x=-40
x=-40/5
x=-8