$\frac{x}{a}+\frac{y}{b}=1$
$\left(3x-7\right)\left(6x-\:8\right)$
$4n+6+n$
$f\left(x\right)=\left(\frac{-20x+4}{ax+10}\right)$
$27p^3+q^3$
$14y^3\:+\:28y^2\:-\:54y\:$
$-6.2-8.4$
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