$\frac{dy}{dx}\left(x^2=\frac{2x+y}{2x-y}\right)$
$y'+\frac{1}{t}y=7cos\left(5t\right)$
$\lim_{x\to a}\ln\left(x\right)$
$3x^2-21x+30$
$1-100x^2$
$3x=-27$
$-5x-1<-6$
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