$10b+4+6-9b-3b-7$
$\frac{dy}{dx}\left(x^2+4y^2=1\right)$
$\left(144y+100x\right)\left(144y-100x\right)$
$836+-130$
$\lim_{y\to2}\left(\frac{1-x}{2-x}-\frac{2x}{x^2-4}\right)$
$\left(x+4\right)^2-\left(4-x\right)^2+\left(x-8\right)^2-x^2-25$
$x^5-40x^4$
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