$-4-5+7+7+3-9+10+12-42$
$\left(-\sqrt{5}\right)^2$
$x^3y=y^2\left(x-4\right)$
$\lim_{x\to5}\left(x^2+x\right)$
$\frac{y^5-2y^3+2y-4}{y-2}$
$2\left(a-3\right)\left(a-2\right)\left(a+1\right)$
$10x-3+5x$
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