$\frac{64a^3+343}{4a-7}$
$a^2-10a-75=0$
$\left(2a+7\right).\left(2a-5\right)$
$\int\frac{1}{\sqrt{2x+7}}dx$
$\int_0^{\infty}47.7e^{-x}dx$
$196x^4-225y^2$
$16n\cdot2-n$
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