$e^xy-x^2=0$
$7m-7n+7q$
$\frac{3}{x+2}\leq4$
$7^{3x+4}=49^{2x+1}$
$\left(8\right)-\left(-7\right)$
$\lim_{x\to4}\left(\frac{x^2-5x+4}{x^2-2x-2}\right)$
$-\frac{420}{-6}$
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