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Sagot :

2x+4=10

2x=10-4

2x=6

x=6/2

x=3

 

3x-7=8

3x=8+7

3x=15

x=15/3

x=5

 

5x+1=-19

5x=-19-1

5x=-20

x=-(20/5)

x=-4

 

8x+4=5x+16

8x-5x=16-4

3x=12

x=12/3

x=4

 

3x+7+2(x-1)=(x+2)+3(x+1)

3x+7+2x-2=x+2+3x+3

3x-3x+2x-x=2+3-7+2

x=0

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