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2x+3=x-5
5x-6=7+2x
2(x+1)+1=x+8


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Răspuns :

2x+3=x-5
2x-x=-5-3
x= -8

5x-6=7+2x
5x-2x=7+6
3x=13   |:3
x=4(3)

2(x+1)+1=x+8
2x+2+1=x+8
2x-x=8-2-1
2x=5   |:2
x=2,5