$b^2+3b-70$
$6a-4x$
$\lim_{x\to0}\left(\frac{x}{\sqrt{1-x}-1}\right)$
$\left(2x^6y^2\right)\left(2x^3-y^2z^2\right)$
$7\left(6\right)+5\left(1\right)$
$2\sec\left(2x\right)^2=3\tan\left(2x\right)+1$
$5-9-5x$
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