$\frac{dy}{dx}\left(5-2x^2\right)=3xy$
$\left(-3\right)^2-\left(5\cdot7\right)+20$
$5x+8=7x-10$
$\lim_{x\to a}\left(\frac{1}{x}\right)$
$121a^2-25t^2$
$x^{2}+10x+100$
$\lim_{x\to2}\left(2-\frac{\sqrt[2]{x+2}}{x-2}\right)$
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