$\frac{2}{\left(x+3\right)\left(x-1\right)}-\frac{1}{\left(x+3\right)\left(x+2\right)}$
$16w\:=\:-20\:+\:17w$
$2^5\cdot2^4\cdot2^{-4}\cdot2^3$
$125x^9-64y^{15}$
$\frac{27+n^3}{3+n}$
$\left(2\sqrt{x}-2\right)\left(2\sqrt{x}+2\right)$
$\left(\frac{7}{5y}\right)^2$
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