$\left(-15\right)-\left(-16\right)+\left(+1\right)x\left(-8\right)$
$\frac{2b^2+b-9}{b-2}$
$\left(2+x\right)\frac{dy}{dx}=9y$
$x^4+3x^3-10x^2$
$-1-y$
$\ln\left(\sqrt{4-x^2}\right)$
$16\:x^2\:+\:7y^2\:-\:3\:+25x^2-1-12y^2$
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