$35\:-\:\left(3-7\right)+4\left(-3-6\right)+7\left(-2+8\right)$
$66-17r+r^2$
$y'=21+18x+21y+18xy$
$\left(a-3b\right)^6$
$\frac{2ab-5c}{a}$
$\lim_{x\to0}\left(\frac{x^2}{\left(\frac{\left(6\cdot\ln\left(3x+1\right)\right)}{3x+1}\right)}\right)$
$3x^2+6x+9$
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