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svp aidez moi pour cette exercice merci d avance :)

resoudre les equations suivantes:
a) 4x = -5
b) 7x + 2 = -3
c) 4x = 7 - 2x
d) 3x - 4 = 8 - 3x


Répondre :

bonsoir

a) 4x = -5
x = -5/4

b) 7x + 2 = -3
7x = -3-2
7x = -5
x = -5/7

c) 4x = 7 - 2x
4x+2x = 7
6x = 7
x = 7/6

d) 3x - 4 = 8 - 3x
3x+3x = 8+4
6x = 12
x =12/6
x =2
a) x=-5/4
b) x=.(-2-3)/7=-5/7
c)x=9x-7=7/9
d)x=2