$5-\left(-67\right)-87-+\left(-72\right)$
$\frac{7}{\cos\left(45\right)}$
$m^3-4m^2n\:5m^3-7mn^2-4m^2n-5mn^2$
$\:2\left(x\:+\:3\right)\:+\:5\left(x\:+\:9\right)\:<\:6x\:+\:100$
$\left(3x-9\right)\left(3x-10\right)$
$\int\frac{6r^{-5}}{1+r^{-4}}dr$
$48x^3y^5+64y^{10}+9x^6$
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