$7a-7b+9a-2b$
$x^2+14x=4$
$\frac{10y^{-3}\:z^{-2}\:}{2y^{-3}\:z^2\:}$
$\left(4\right)\left(5\right)-\left(3\right)\left(2\right)$
$4cos^2x+2sin^2x-3=cos2x$
$32^2+2\left(32\right)\left(16\right)+\left(16\right)^2$
$\frac{dy}{dx}\left(x^2y^2-cosy\right)$
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