$x\cdot7=-28$
$3ydx\:+\:2xdy=0$
$\left(9a-5y\right)\left(2a+6a\right)$
$x=2-y^2$
$z^2-4z=4$
$\frac{-3t-9}{t^2-t-2}$
$\lim_{x\to-\infty}\left(1-\frac{3}{x}\right)^{2x}$
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