$3x+2;x=3$
$x^2+x+3x^2-3x$
$\int\left(\frac{3}{2x+100}\right)dx$
$\lim_{x\to0}\left(\frac{1+\cos\left(\pi x\right)}{\tan^2\left(\pi x\right)}\right)$
$\frac{d}{dx}\left(x^{ax^6}\right)$
$\frac{dy}{dx}-6x^2y-x^2=0$
$-7x-2\ge\frac{1}{4}x+1$
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