$4x+8=2x-12$
$\lim_{x\to0}\left(\frac{e^x-e^{-x}}{x-\frac{3}{2}\sin2x}\right)$
$x^2+7x=8$
$\frac{7}{\frac{7}{n}}$
$\frac{30y^3}{60y^2x}$
$x^2-3x\:-40$
$3y+x-3\left(4+x\right)-5y+2$
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