$\frac{828a^{-2}b^{-2}}{-69a^{-2}b^{-2}}$
$10x^2-8y+16;\:x=3;\:y=2$
$4xy+7x-3y-2xy-x-v$
$-7x^2\:-\:x\:+\:6x\:+\:x^2$
$\frac{d}{dx}\left(y=x-\frac{1}{x}\right)$
$49r^2-81p^2$
$-5r+\:8r\:+\:5$
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