$10-x=12$
$-120\cdot4$
$\lim_{x\to2}\left\{\frac{x^2-4}{\sqrt{3x-2}\sqrt{x+2}}\right\}$
$x^2+18x=-77$
$\frac{a}{-7}-7=5$
$-2x+5y-z=10$
$2x\sqrt{2}$
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