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[x2(x3)-2x(x3)+5(x3)+x2(2x2)-2x(2x2)+5(2x2)+x2(-x)-2x(-x)+5(-x)]
x5-2x3+5x3+2x4-4x2+10x2-x3+2x2-5x
x5+2x4+2x3+6x2-5x