2x4-55x2+400+2x3-24=0
(x+4)(2x3-6x2-31x+100)=0
(x+4)2(2x2-14x+25)=0
x=-4
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2x4-55x2+400+2x3-24=0
(x+4)(2x3-6x2-31x+100)=0
(x+4)2(2x2-14x+25)=0
x=-4