$x^2+2x-89$
$\left(2a^2b^3+c^2d^4\right)^3$
$zw-wx=y\:+z$
$\frac{c^7}{c^9}$
$\left(f+3\right)^3$
$\left(8y-\frac{2}{3}x\right)^2$
$\left(9x^2-25\right)\left(9x^2+25\right)$
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