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The common denominator of the two fractions is: 105

$ \frac{(2+5)}{(3+12)} = \frac{(7*(2+5))}{(7*(3+12))} =\frac{ 49}{105} $

$ \frac{6}{7 }= \frac{(6*(3+12))}{(7*(3+12))} =\frac{ 90}{105} $

Fractions adjusted to a common denominator

$ \frac{(2+5)}{(3+12)} +\frac{ 6}{7 }=\frac{ 49}{105 }+\frac{ 90}{105} $

$ \frac{49}{105 }+\frac{ 90}{105 }= \frac{(49+90)}{105} $

$ \frac{(49+90)}{105 }=\frac{ 139}{105} $

$ $

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