0
By implication numbers in mathematics are positive unless stated otherwise.
Where confusion may arise the positive or negative sign is shown for purposes of clarity.
(+6) - (-7) = ? This would normally be written as 6 - (-7) = ?
If the "7" were a positive number then the result would be :-
6 - (+7) = 6 - 7 = -1, but "7" is a negative number and subtracting a negative number is equivalent to adding a positive number.
So, (+6) - (-7) = 6 + (+7) = 6 + 7 = 13
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