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hirondelle52

Bonjour;

a) 3x + 7= 31

3x = 31-7

3x =  24

x = 24/3

x = 8

b) - 8x-5 = 15

-8x = 15 +5

-8x = 20

x = -20/8

x = - 5/2

x = -2,5

C) 12 x + 7 = - 13

12x = -13 -7

12x = -20

x = -20/12

x= -5/3

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