$-\frac{\ln\:\left(x\right)}{x+1}+\ln\:\left(\frac{\left|x\right|}{\left|x+1\right|}\right)$
$3x-11y-a+20x-1-y$
$\frac{7}{10}\cdot450.000$
$\left(x+y\right)\left(2x+6y\right)$
$\left(n-\:\frac{2}{7}\right)^2$
$9x^2-\left(2y-1\right)^2$
$352\:-\:-\:525$
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