$5u\:-\:10u$
$7x^4-28x^3+21x^2+28x-28$
$-3x^4-6x^3+9x^2+3x$
$\frac{dy}{dx}=\frac{y}{x^2-22x+72}$
$\frac{9x^{2\:}y^7}{3x^2y^7}$
$\log\left(\sqrt{7x+51}\right)-1=\log\left(9\right)-\log\left(\sqrt{2x+67}\right)$
$\frac{d}{dx}6x^2-7$
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