2y(a-b)-5(ax-bx)=
szybkoo,jeden.przyklad;D
2y(a-b)-5(ax-bx)=2ay-2by-5ax+5bx
2y(a-b)-5(ax-bx)=2ya-2yb-5ax+5bx
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2y(a-b)-5(ax-bx)=2ay-2by-5ax+5bx
2y(a-b)-5(ax-bx)=2ya-2yb-5ax+5bx