Réponse :
a. 7a - 8 = 3a + 7
7a -3a -8 -7 =0
4a -15 =0
4a =15
a= [tex]\frac{15}{4}[/tex]
b. -2a + 3 = 14a -1
-2a -14a = -3- 8
-16a = -11
a = [tex]\frac{11}{16}[/tex]
c. 3a -4 = -5a -8
3a +5a = 4-8
8a= -4
a =[tex]\frac{-4}{8}[/tex]
d. 7a -6 = 9a -11
7a- 9a = 6 -11
-2a = -5
a =[tex]\frac{5}{2}[/tex]
