$x-13=44$
$2a^2+5a+12$
$\left(\frac{2}{5}xy^{2}z\right)\cdot\left(\frac{25}{4}x^{2}y\right)\cdot\left(-2yz^{-3}\right)$
$3+t=-5$
$\frac{2x-2}{x+3}$
$7-\left(13+9\right)$
$\int\cos\left(7t\right)\cos\left(5t\right)dt$
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