$x\:-\:17\:=\:12$
$\frac{2x}{x+3}+\frac{x+3}{x-5}$
$-4^{-1}\cdot4^3$
$\left(6\cdot10^{-9}\right)\left(3\cdot10^7\right)$
$\:\frac{9x}{x^2+7x-8}$
$\frac{9n^{-3}}{-10n^{-9}}$
$\left(x^6y^7\right)^{-2}$
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