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Sagot :

GEGE000

Réponse:

x-7=10

<=> x = 10 +7

<=> x = 17

4x=16

<=> x=16/4

<=> x= 4

3x+4=5x-9

<=> 3x-5x = -9-4

<=> -2x = -13

<=> x= 13/2

7(x-4)=5(8-x)

<=> 7x-28 = 40-5x

<=> 7x+5x = 40 + 28

<=> 12x = 68

<=> x = 68/12

<=> x = 17/3

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