$5\left(x+1\right)+6\left(x+2\right)=7\left(x+3\right)$
$\cos\left(\frac{x}{2}\right)=5$
$\left(mn\:+\:4\right)\:\left(mn\:-\:4\right)$
$10-423$
$51^22^33$
$\int\left(\frac{6x^2-9x}{x^4-81}\right)dx$
$\left(\frac{3x}{x-3}\right)+\left(2\right)=\left(3x-1\right)$
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