$(3x-3) - (3x+3)$
$(10x^2 - x^3)^2$
$\dfrac{20x^2y-30xy^2+25x^2y^2+70x^3y^3}{25x^2y^2}$
$(24x-72X^2+80x^3)(9x^{-1})$
$(7x^3+4xy-12y^3)(2x-2y)$
$(94xy+72x^2y-9xy^2) + (12xy-9xy^2)$
$\dfrac{54p^2q-72pq^2+90p^2q^2}{9pq}$
$(5x^2-1)^3$
$(72x+2y^2)(-52x+2y^2)$
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