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Sagot :

Bonsoir

a. 7x=21

7x/7=21/7

x=3

b.-3x=12

-3x/(-3)=12/(-3)

x=-4

c.4x+2=x+11

4x-x=11-2

3x=9

x=3

d.4x-3=5

4x=5+3

4x=8

x=2

Voilà

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