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The common denominator of the two fractions is: 84

$ \frac{7}{12 }= \frac{(7*7)}{(7*12)} =\frac{ 49}{84} $

$ \frac{2}{7 }= \frac{(2*12)}{(7*12)} =\frac{ 24}{84} $

Fractions adjusted to a common denominator

$ \frac{7}{12 }-\frac{ 2}{7 }=\frac{ 49}{84 }-\frac{ 24}{84} $

$ \frac{49}{84 }-\frac{ 24}{84 }= \frac{(49-24)}{84} $

$ \frac{(49-24)}{84 }=\frac{ 25}{84} $

$ $

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