-28
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In order to have an addition problem to equal a negative number, you must add a negative number, which would render it subtraction.
How about: 30+2 = 32 as one example
(30 + 3√85) ≈ 57.659 (30 − 3√85) ≈ 2.341
28 2 27 3 29 1 etc...
two prime numbers when added together will equal 63: 2 + 61
The numbers are -10 and -70