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x in (-oo:+oo)
((8000/12000)^1)/5 = x // - x
((8000/12000)^1)/5-x = 0
(8000/12000)/5-x = 0
2/15-x = 0 // - 2/15
-x = -2/15 // * -1
x = 2/15
x = 2/15
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