$\frac{14}{2}$
$\left(-3n+4m+5y\right)-\left(m-n+y\right)$
$\left(+9\right)\left[-5+3+\left(-7\right)\right]$
$13.5\cdot13.5$
$\left(-x-z\right)^2$
$\int\:\frac{\left(1+3e^{-2x}\right)^4}{e^{2x}}dx$
$20+890+51\cdot$
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