exercice 36 svp... ça m'aiderait c'est pour demain, c'est dur...

a)
6a + 10 = 26
6a = 26 - 10
6a = 16
a = 16/6
a = 8/3

b)
- 12 - 5b = - 32
- 5b = - 32 + 12
- 5b = - 20
5b = 20
b = 20/5
b = 4

c)
15c - 74 = 76
15c = 76 + 74
15c = 150
c = 150/15
c = 10

d)
120 - 8d = 20
- 8d = 20 - 120
- 8d = - 100
8d = 100
d = 100/8
d = 12,5