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31x-4=x-2
30x=2
Sprawdzenie
0,2x+2=-3-0,8x
0,2x+0,8x=-3-2
x=-5
Sprawdzenie
0,2·(-5)+2=-3-0,8·(-5)
-1+2=-3+4
1=1
2(x-1)=x+3
2x-2=x+3
2x-x=3+2
x=5
Sprawdzenie
2(5-1)=5+3
2·4=8
8=8