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Yes.
SUM means plus 4+7=11
The sum of 3 plus 4 is 7.
14 = 7 + 7
f+7=12 is the equation so, f=5
7(7 + 9)
The sum of 7 plus 71 is 77.
The sum is: 8
3 + 7 is an ADDITION sum
The sum is 1511.
negative 4
-4
7+3+10 = 20