$a^4\:b^4-1$
$2x+4<x+18$
$xdy-xdx=9yxdy$
$\log\left(x\right)+\log\left(20\right)=3$
$\int_{-15}^{-5-5\sqrt{2}}\left(\frac{1}{\left(x+5\right)\left(\sqrt{10x+x^2}\right)}\right)dx$
$15b+13c-12b+10c+8$
$4x^2+3x+6=0$
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