$\lim_{x\to-\infty}\left(-\frac{1}{4}e^{-x^4}\right)$
$\frac{1}{2}x-21$
$\:\left(\sqrt{x}\right)^{5x}$
$5xy-8y+9x=12$
$7b+7b$
$\sqrt{10-x}+5=7$
$x^2+6y-1;\:x=-3$
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