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(5+x)(6+x)(8+x)=240+320cm³
(30+x²+11x)(8+x)=560cm³
240+8x²+88x+30x+x³+11x²=560cm³
x³+19x²+118x+240=560cm³
x³+19x²+118x+240-560=0
x³+19x²+118x-320=0
rozwiązaniem jest liczba 2.