$\frac{1}{y+2}\:=\:\frac{y}{6y+21\ }$
$100x-100+90-90x$
$\int\left(12x+3\right)^{-1}dx$
$2^{3\cdot3\cdot3}$
$\frac{x^{6}+y^{6}}{x-y}$
$\log\frac{\left(xy^3\right)}{z^2}$
$2b+3b^2;\:b=3$
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