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If 3x = 81 then x = 27 and 27 cubed = 19683
4X2+X3+3X+7Y+2X3 can only be simplified to 3X3+4X2+3X+7Y, because X3 and 2X3 are the only like terms.
1-3x1=3x 1/3=x
x3 + 2x2 + 3x + 6 = x2(x + 2) + 3(x + 2) = (x + 2)(x2 + 3)
Assuming simplify = factor...x3 - 3x + 2 = (x-1)(x2+x-2)