$-8-\left|-5+\left(-1+2-3\right)\right|+\left(4-1-8+2\right)+1$
$6log2\left(x\:+\:6\right)\:=\:30$
$\left(x+1\right)^2-\left(y-2\right)^2$
$\int x^{-2}e^{2x}dx$
$920+90+51$
$\lim_{x\to-9}\left(\frac{x^2-81}{x^2+27x+162}\right)$
$-8x^2-20x+48\ge0$
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