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3(-4)+7=-5
-12+7=-5
-5=-5
2(x+6)=-4
2(-4+6)=-4
-8+12=-4
-4=-4
2(x+6)=-4
za niewiadoma wstawiamy -4
3x=-5-7
3x=-12/3
x=-4
podstawiamy -4=-4
2(x+6)=-4
2x+12=-4
2x=-4-12
2x=-16/2
x=-8
podstawiamy -4=-8 nie pasuje