$x+20=4x-4$
$\left(y^4-6y^3+2y^2+3y-4\right)\left(y^2-y+2\right)$
$\lim_{x\to2}\left(\frac{x+1}{x-2}\right)$
$\left(x\:+7\right)^2$
$x^2+9\ge0$
$\left(7h+3k\right)^2$
$-57+1$
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