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(x³+19x²)+(118x-320)=0
x²(x+19)+2(59x-160)=0
(x²+2)(x+19)(59x-160)=0
x²+2=0 i x+19=0 i 59x-160=0
x²=-2 i x=-19 i 59x=-160/:59
x=0 x -160/59