$\frac{x^9}{x^5}$
$\frac{3x^3+2x^2-3x-2}{x^2-1}$
$2\cdot2+5$
$\left(-a+3\right)\left(-a-7\right)$
$\left(2-7\right)+5\cdot3+1-\left(12\cdot5-3\right)$
$\int7sen^2\:x\:dx$
$x+2x+x+2x+2x-x-x$
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