$\left(5n+4\right)\left(2n-3\right)$
$2ab+4ac+ab-ac$
$\:8\left(s\:+\:7\right)=72$
$25x^2+50y^2+5x-25$
$\frac{dy}{dx}=\frac{e^{5x+y}}{xy}$
$f\left(x\right)=\frac{x}{x+\frac{x}{c}}$
$12x^2-31<2$
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