$6x^2-5x-1=0$
$\left(x-2x^3-3+3x^4\right)\left(2x^2-1\right)$
$x^2-3x-20\le0$
$w^2-7w+16$
$0,2^{\left(\infty\right)}$
$\left(x^2-3xy-y^2\right)+\left(9y^2-8xy+19x^2\right)$
$\frac{dy}{dx}=\frac{1}{x^4}+\cos\left(x\right)$
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