Suma de fracciones

Add the following fractions and simplify the result

6
6
 +
1
3
 =
4
7
 +
2
4
 =
1
5
 +
5
7
 =
6
6
 +
7
4
 =
4
3
 +
7
4
 =
7
4
 +
6
2
 =
5
2
 +
5
6
 =
4
7
 +
1
5
 =

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