$\frac{2x-6x-2}{x-4}$
$\int\frac{x^4}{x^4-81}dx$
$\left(\frac{a^2}{a^2}\right)\left(\frac{a^{-2}}{a^{-5}}\right)$
$x^8\cdot\frac{x^8}{x^2}$
$x+1=2x+7$
$\int_1^x\left(cos\left(3t\right)\right)dt$
$\int\frac{x-5}{x^2-x-2}dx$
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