$24a^2b-12ab^2$
$\lim_{x\to1}\left(\frac{ln\:x-1}{1-\left(x-1\right)}\right)$
$\left(-3x+y-1\right)dx\:\left(x+y+3\right)\:dy=\:0$
$z+55=70$
$3+\tan^2\left(x\right)=\frac{1}{\cos^2\left(x\right)}$
$3\cdot\left(-10\right)+1$
$27\cdot5$
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