$\left(\frac{1}{3}a-3b\right)\left(\frac{1}{9}a^2+ab+ab^2\right)$
$-1+logx=\frac{-1-logx}{logx+1}$
$8x+1>21-2x$
$\frac{dx}{dt}=2-y$
$6x\left(x\:-\:2\right)\:+\:7\left(x\:-\:2\right)$
$-140\left(-13\right)\left(4\right)$
$y^2=4tx$
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