$\frac{1}{2}\left(8x-4y\right)-\frac{1}{3}\left(6x-9y\right)$
$\frac{dr}{dg}=\frac{sen\:g\:+\:e^{2r}\:seng}{3e^r+e^rcosg}$
$\frac{d}{dx}4x^2+2xy+y^2=12$
$\left(4bc+\frac{1}{3}abc\right)$
$\frac{\frac{21}{17}+3}{4}+\frac{\frac{21}{17}+6}{3}=2\left(\frac{21}{17}+1\right)$
$3n^2-60n+300$
$7b+6b-3b+8k$
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