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x in (-oo:+oo)
X/7-4 = x^7 // - x^7
X/7-x^7-4 = 0
-1*x^7 = -(1/7*X-4) // : -1
x^7 = 1/7*X-4
x^7 = 1/7*X-4 // ^ 1/7
x = (1/7*X-4)^(1/7)
x = (1/7*X-4)^(1/7)
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