$a\left(p-q\right)^2+4pq$
$\frac{7^5x\:7^3}{7^2}$
$\left(8^2\right)^{5\:}$
$\left(2x+3y\right)\left(-x+2y\right)$
$\frac{dy}{dx}=4-\frac{y}{50}$
$n^2+18n$
$\left(y-2\right)\left(y+2\right)\left(y-2\right)$
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