$x^3+2x^2-15x$
$-40\cdot x^2+280\cdot x=0$
$y^2+3y^2-6y+4y^2$
$x^2-3x+4>0$
$\left(1+x\right)\frac{d}{dx}\left(y\right)-xy=x+1$
$3-\left(-12\right)$
$-x<-x+7\left(x-2\right)$
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