$\left(+12\right)+\left(-1\right)-\left(-15\right)$
$x2\:-\:x\:+\:100$
$\left(x+7\right)\left(2x+8\right)$
$4x^2-12x-11$
$\lim_{x\to0.99}\left(\frac{2x+1}{x-1}\right)$
$x\sin2y\frac{dy}{dx}=\left(x+1\right)^2$
$\left(-19\right)-\left(-3\right)$
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