$\frac{18.4\:+x}{2}$
$12^2b+5^2n$
$h^2-h-30$
$36x^2-72x+81$
$\left(x+y\right)\left(x+y\right)+\left(x+y\right)$
$\left(7mn-4m^2n\right)^2$
$\int\frac{2x^{2}+x+9}{\left(x+1\right)\left(x+4\right)}dx$
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