$\frac{1+\frac{1}{c-1}}{1-\frac{1}{c-1}}$
$200mn^2n-50mn^2$
$17-\left(-1\right)$
$-4>-x$
$\int \frac { x } { ( x + 1 ) ( x ^ { 2 } + 1 ) } d x$
$24^2+34+5$
$x\:+\:25=\:42$
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