$\left(2n\right)+\left(2n+2\right)+\left(2n+4\right)$
$\frac{8}{9}nm^2-\frac{1}{2}nm^2+\frac{7}{2}nm^2$
$7-3\cdot2$
$15x^4-23x^3-81x^2+47x-6$
$\frac { ( 3 ) ( 5 ) ( 8 ) } { ( 3 ) ( 4 ) }$
$\frac{5x+4}{14}-\frac{7x}{6}$
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