Simplifying
$18x^4y^2-7x^4y^2$
$\left(y^2-y^{-2}\right)^3$
$\lim_{x\to3}\left(\frac{x^3-26}{x-3}\right)$
$\left(x-2\right)\left(x+1\right)=0$
$16x^2-48x^2+36$
$64^2-40x+25$
$4a^2-3a-6a^2+2a$
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