Infinitely many. Here are some:
0+7 and 1+6
Between them there are 0.1 + 6.9, 0.2 + 6.8 et cetera
between them there are 0.01 + 6.99, 0.02 + 6.98 and so on.
and between them ...
The above can go on forever.
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7
in the equation 3+4=7, 3 and 4 are the addends. 7 is the sum.
The sum of a set of addends whose sign is the same is the sum of the absolute values of the addends with the same sign as the addends.
The sum could be anything, but it would be a positive number if the two addends are positive.
You add two addends to get a sum. For example, in 3 + 5 = 8, 3 and 5 are addends, and 8 is the sum.