166
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The average of 79, 84, 82, and 87 is 83.
Take any multiple of 87, and you get a number that is divisible by 87 - for example:87 x 0 87 x 1 87 x 2 87 x 3 ... 87 x (-1) 87 x (-2) ...
It is 79/90.
1 x 87, 3 x 29, 29 x 3, 87 x 1 = 87
Assume that the expression is x8 - 87 + 166 or x8 + 79. The expression is not factorizable since 79 is not the perfect 8th number!