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Sagot :

Explications étape par étape:

a. 2x-2=2

2x=2+2

2x=4

x=4/2=2

b.3z-10=11

3z=11+10

3z=21

z=21/3=7

c. 1-y=0

-y= -1

y = 1

d. 1+5x = -39

5x= -40

x = -40/5 = -8

e. 2+3z= 9

3z= 9-2

3z = 7

z= 7/3

f. 6-y = -2,3

-y = -2,3 -6

-y = -8,3

y = 8,3

g. 7-3x = -22

-3x = -29

x = -29/-3

x = 29/3

h. 5+6z= -11

6z= -16

z= -16/6

z= -8/3

i. -x-9 = 11,2

-x = 20,2

x= -20,2

j. 9,7y-5,7= -1,7

9,7y = 4

y = 4/9,7

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