$4x\:+\:20$
$6cosx^2=2sinx+2$
$\frac{x^3-5x+2}{x^2+2x-1}$
$9u^2-48u+64$
$y^3-xy^3$
$-5\::\:-5$
$\frac{dy}{dx}=\frac{xy}{x^2-3}$
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