$y'\:=\frac{-x}{y-2x}$
$b+a+c-a-c$
$\left(\left(\left(-2\right)^{19}\right)^8\right)^4$
$\frac{-\pi}{1}-\left(-\frac{\pi}{\infty}\right)$
$\left(x+3\right)\left(x+7\right)+2\left(x^2+2x+10\right)$
$\lim_{x\to\infty}\frac{5+x-4x^2}{\sqrt{1+x^2+2x^4}}$
$144-b^8$
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