Bonjour,

a. 2x-2=2

2x-2+2=2+2

2x=4

2x÷2=4÷2

x=2

b. 3z-10=11

3z-10+10=11+10

3z=21

3z÷3=21÷3

z=7

c. 1-y=0

1-1-y=0-1

-y=-1

-y÷(-1)=-1÷(-1)

y=1

d. 1+5x=-39

1-1+5x=-39-1

5x=-40

5x÷5=-40÷5

x=-8

e. 2+3z=9

2-2+3z=9-2

3z=7

3z÷3=7÷3

z=7/3