$7x-49=0$
$\lim_{x\to0}\left(\frac{9x}{x}\right)$
$1+-3+14$
$2a^2+28a+98$
$\frac{dy}{dx}-4xy=\frac{5x}{4}$
$\int\left(e^{-0.40t}\right)dt$
$5^2\cdot5^9$
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