$3\left(x+7\right)+5x\left(x+7\right)$
$\left(-5.683\right)\cdot17854728\:$
$2ab-30$
$\lim_{x\to0}\left(\frac{1}{ln\left(1+x\right)}-x\right)$
$4\left(-5x+2\right)-6$
$8r+10-11s-7-18s$
$\int\:\:\frac{-2x+2}{e^x}dx$
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