$x^4+3x^2=x^2$
$\frac{dy}{dx}=4x+y+6,y\left(0\right)=2$
$x^4-6x^3+3x^2+10x$
$x^2+x-21$
$x+2\ge7$
$\int x^3\sqrt{2x^2+1}dx$
$x^2+2xb-x^2$
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