$-2x=-2x^2+4$
$4y^2-7y^2-6y^2$
$\left(-50\right)-\left(-5\right)$
$\left(x+y\right)\:\left(z-t\right)$
$7-5-\left(+12\right)-\left(-3\right)$
$\lim_{x\to-2}\:\:\left(2-x\right)^2$
$\lim_{x\to0}\left(-x^{-2}e^{\left(\frac{1}{x}\right)}\right)$
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