$x\frac{dy}{dx}-y=2x^2y,\:y\left(1\right)=1$
$y=5x^2+6x+3$
$\left(x+6\right)\left(x-6\right)+\left(x+7\right)\left(7-x\right)$
$2x-8>3x+2$
$\frac{2x}{3}+2=4$
$\frac{1}{3x^9+10x^{10}}$
$-2\left(2\right)^2+3$
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