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There are two of them that do that: -108 and +108 .
-141
9 times 12
ab = 108 => a != 0, b != 0 so we CAN write b = 108 / a a + 108 / a = 56 Multiply both side by a a^2 + 108 = 56a. It's a simple quadratic equation, it will always have a solution over the Complex number, may be even REAL roots. so when you are done with a, move on to b. This is hardly abstract.
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