$xy'\:+\:2y\:=\:15x^3\:+\:9x$
$\left(9y^5+2\right)^2$
$\left(x^3+7y\right)\left(x^2-7y\right)$
$j\cdotu^{n}-v^{2}\right)^{3}$
$2x^2-30x-300=0$
$\frac{1-cos^2x}{xsinx}$
$xdx+e^{-x}dy=0\:$
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