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x in (-oo:+oo)
2*13*x^8-(7/8) = 12 // - 12
2*13*x^8-(7/8)-12 = 0
2*13*x^8-7/8-12 = 0
26*x^8 = 103/8 // : 26
x^8 = 103/208
x^8 = 103/208 // ^ 1/8
abs(x) = (103/208)^(1/8)
x = (103/208)^(1/8) or x = -(103/208)^(1/8)
x in { (103/208)^(1/8), -(103/208)^(1/8) }
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