$7x+29=11x-31$
$\lim_{x\to0}\left(\frac{5-\cos\left(x\right)}{9x^2}\right)$
$x^2\cdot\frac{dy}{dx}-4\cdot x\cdot y=10$
$\left(10x+4y-98\right)^2$
$\sqrt{6}.875=a$
$\left|\left(+4\right)-\left(+16\right)\right|$
$x^2+2x-8\le0$
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