$2x^4-2yx^2$
$9y^2-30x^2y+9y^2$
$\left(t^7-12\right)\left(8+t^7\right)$
$\left(-8b+2a\right)\left(8b+2a\right)$
$xy^{-\frac{1}{8}}$
$80y+30-40y-y+40+20+60y$
$\frac{4x^2-9y^2}{2x-3y}$
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