$436.31=220+0.97x$
$-94x+2y=4$
$\frac{dy}{dx}=\frac{\left(2x+4y-2\right)}{\left(x+2y-5\right)}$
$\lim_{x\to0}\left(\frac{\sqrt{81-x^2}-9}{4x}\right)$
$f\left(x\right)=\frac{-x}{\left(1+x\right)^2}$
$\int\frac{3x^2}{\:3+x^2}dx$
$2x^3vm-4x^2n+x^2v^2n$
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