$\frac{x^2+x}{4x}$
$\frac{1}{sin\:4x}$
$\frac{8x^4}{x^2}$
$-20\cdot\left(-2\right)\cdot10$
$-6^{x-1}+3b^{y-2}+4a^{x+1}-7b^{y-2}$
$4\left(ax^2-b\right)^4$
$\frac{-7}{\infty}$
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