5 + the decimal part of root 7 is a, 11 minus the decimal part of root 7 is B, find the value of a plus B and a minus B

The decimal part of 5 + radical 7 is radical 7-2 (radical 7 is more than 2 points)
The decimal part of 11 followed by 7 is 3-radical 7
A + B = radical 7-2 + (3-radical 7) = 1
A-B = radical 7-2 - (3-radical 7) = 2 radical 7-5

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