$\left(\frac{e^x}{1+x^2}\right)\left(xe^x\right)$
$x^2-22x+25$
$\frac{dn}{dt}+\:n\:=\:nte^t\:^{+\:9}$
$log\left(3x-2\right)=2$
$\left(x-15\right)\left(x-2\right)$
$2-3\cdot\left(-2+10-4\cdot0.66-8\right)-2$
$-12a-8a+4a+a$
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