$y'+3y=21$
$\sec\left(y\right)\frac{dy}{dx}=\sin\left(x-y\right)+\sin\left(x+y\right)$
$3x^9\cdot\:2x$
$2x^3+x^2-5x+2$
$\frac{125x^8y^2}{125x^3y}$
$\left(x+\frac{2}{5}\right)\left(\frac{1}{2}x+\frac{1}{6}\right)$
$2n+3n+4n-n+9n$
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