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Sagot :

Bonsoir

 

15 +9x - x +3 = 0

9x-x = -15-3

8x = -18

x = -18/8 = -9/4

3(5+3x)-(x-3)=0

donc 15+9x-x+3=0

donc 8x=-18

donnc x=-18/8

donc x=-9/4

donc x=-2,25

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