$x^2+x-21$
$\left(+85\right)-\left(-97\right)$
$4^5.4^3$
$\lim_{x\to0}\left(\frac{5^x-4^x}{x^2-x}\right)$
$-3\cdot36$
$\frac{dy}{dx}-4xy=6x$
$2x^2+9x+10=0$
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