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Sagot :

Bonjour,

3x-1=2x+7

3x-2x = 7+1

x = 8

4x+5=2x+1

4x-2x = 1-5

2x = -4

x= -4/2

x= -2

6x-9=3x+12

6x-3x = 12 +9

3x = 21

x= 21/3

x= 7

6x+2=-2x+4

6x+2x = 4 -2

8x = 2

x= 2/8

x= 1/4

x= 0,25

-2x-6=7x+2

-6 -2 = 7x +2x

-8 = 9x

x= -8/9

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