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Sagot :

PAMC

Bonsoir,

a. x-3=-1

x-3+3=-1+3

x=2

b. 2y=5

2y:2=5:2

y=2,5

c. 5x=2x+9

5x-2x=2x-2x+9

3x=9

3x:3=9:3

x=3

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