$-4n+8+9n-2$
$50\cdot7.5$
$\frac{3b^77b^{-8}}{-7b^{-10}}$
$\frac{x^5+12}{x^2+x+2}$
$3^5+3\frac{-5}{1}$
$\left(\frac{1}{2}a^3+\frac{2}{3}b^2\right)\left(\frac{1}{2}a^3+\frac{2}{3}b^2\right)$
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