$\left(2x-3\right)^2-\left(x-5\right)^2$
$\left(16x-7y\right)^2$
$3xy^2+5y-y^3$
$2a^2b^32c^3$
$250-\left(-68\right)-\left(-12\right)$
$\left(7x-2\right)\left(2x+4\right)$
$\left(4a-t\right)^3\cdot t\cdot\frac{1}{12}$
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