$\sqrt{81}-4\:x\:5\:+3^3$
$-10\left(\frac{1}{5+m}-\frac{1}{5}\right)+\frac{1}{2}$
$n+n+2+n+4+n+6$
$\frac{12x+10y}{2}=30$
$36x^2-180x$
$\int\left(6x+5\right)dt$
$6c^2-c-15$
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