$\frac{5x+20}{x}\:=7$
$-5\left(6x\:+\:5\right)\:=\:125$
$1-\sin^2$
$t=\frac{x-2}{x+2}-\frac{1}{x-2}+\frac{6x-x^{2}}{x^{2}-4}$
$\lim_{x\to0}\left(-x^{-2}-2x^2-3\right)$
$ydx+\left(2x+3y\right)dy-0$
$2x\:+\:6=-12$
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