$4\sqrt[2]{3b}+8\sqrt{3b}-9\sqrt{3b}$
$\sqrt{-89}$
$3x^2-12x+4x^2+13x-2x^2+3x+18x^2-13x$
$23+x=52$
$c^2+4c+4$
$\frac{-21}{7}$
$\left(2xy+x^2+3y^2\right)\frac{dy}{dx}+\left(y^2+2xy+3x^2\right)=0$
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