$4x+40+100$
$16-x^2\:+x^2-1$
$\int12\cos\left(x^2\right)dx$
$\frac{1}{5m}-\frac{5-7n}{15mn}$
$x^2+x-21$
$\left(a+f\right)^2$
$3x^2-12x-5$
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