Rozwiąź równania i sprawdz :
a) 6x-(x+1)=6
b) 2(x-1)+3(x-2)=7
c)3(x+2)+2(2x-3)=x-12
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a) 6x-(x+1)=6
6x-x-1=6
6x-x=1+6
5x=7 /5
x=1,4
b) 2(x-1)+3(x-2)=7
2x-2+3x-6=7
2x+3x=2+6+7
5x=15 /5
x=3
c)3(x+2)+2(2x-3)=x-12
3x+6+4x-6=x-12
3x+4x-x=-6+6-12
6x=-12 /6
x=-2