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Sagot :

Réponse:

a . 5x+4=19

5x=19-4

5x=15

x=15/5=3

b. -3x+7=16

-3x=16-7

-3x=9

x = -3/9

x=-3

c. -2x+5 = -5

-2x=-5-5

-2x=-10

x =-10/-2

x=5

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