$x^2+2x-12=0$
$\lim_{x\to0}\left(-5x+9\right)$
$\frac{dx}{dy}=\frac{x^2.y}{\left(1+x\right)}$
$\left(ab+\left(a^2-3\right)\right)^2$
$4a^2-20+4b^2$
$7y-8^2$
$\:\frac{2+\frac{2}{x}}{4-\frac{4}{x}}\:$
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