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The sum of 7 and -8 is -1.
The sum of 15 and -7 is 8.
(7 + 3i) + (8 + 9i) = (7 + 8) + (3i + 9i) = (7 + 8) + (3 + 9)i = 15 + 12i Which can also be written as: 15 + 12i = 3(5 + 4i).
7/8 1/2 + 1/4 + 1/8 = 4/8 + 2/8 + 1/8 = 7/8
The sum of 1 and 7 is 8. That is, 1 + 7 = 8