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Sagot :

KIARABARDIES2
Exercice 3 :

A)

7x + 17 = 9x + 29
7x - 9x = 29 - 17
- 2x = 12
x = - 6

B)

3x - 5 = 7x - 3
3x - 7x = - 3 + 5
- 4x = 2
x = - 0,5
ANGEELIINA
Pour l'exercice 3 :
A) 7x-9x=29-17
-2x=12
X= 12/-2 = -6

B)3z-7z=-3+5
-4z=2
a=2/-4=-0,5

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