$\frac{-18}{-2}\:+\:4\left(-3\right)\:+\:5\:-\:\left(-2\right)$
$3+-2-6+5-9-12+-13$
$x^{2}+8<2x$
$\int8^sds$
$\left(21x-14y+x\right)-\left(18x+12y+x\right)$
$\left(m^2n-7\right)\left(m^2n+14y\right)$
$\left(2x^{-3}y^{-2}\right)\left(10xy\right)$
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