$-4\left(-2\right)^2\:-6\left(2\right)$
$2x^2-10x-25$
$-9\:+\:4q\:=\:-9q\:+\:4$
$25a^2+4+20a$
$\frac{dy}{dx}+\frac{2xy}{x^2+1}=\frac{1}{x^2+1}$
$\frac{dy}{dx}=9x^2\left(4+y^2\right)^{\frac{3}{2}}$
$-22=\frac{g}{10}$
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