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Sagot :

coucou

7x - 4 = 3 ( 3x + 7 )
7x - 4 = 9x + 21
7x - 9x = 21 + 4
-2x = 25
x = -25/2

x - 3x + 1 - 8 - 10 + 9x = 0
-2x + 9x + 1 - 8 - 10 = 0
7x - 7 - 10 = 0
7x -17 = 0
7x = 17
x= 17/7
voila bisouu

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