$-11+x=15$
$-x^2+6x+7=0$
$\left(a+21\right)^2$
$\frac{c}{c^8}$
$\:512p^{18}+r^{12}$
$\int\frac{5x^2-3}{x\left(x-2\right)\left(x+1\right)}dx$
$\frac{x-1}{4x+4}-\frac{x+2}{8x-2}$
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