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a)2(7x+5)-6(x-2)=14x+10-6x+12=8x+22
b)-2x(8-x)-5(x²+3x)=-16x+2x²-5x²-15x=-3x²+x
b) -2x(8-x)-5(x²+3x)=-16x+2x²-5x²-15x=-31x-3x²
Mam nadzieję że dobrze :)