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x in (-oo:+oo)
y-5 = (-7/8)*x^16 // - (-7/8)*x^16
y-((-7/8)*x^16)-5 = 0
(7/8)*x^16+y-5 = 0
7/8*x^16 = -(y-5) // : 7/8
x^16 = 8/7*(5-y)
x^16 = 8/7*(5-y) // ^ 1/16
abs(x) = (8/7)^(1/16)*(5-y)^(1/16)
x = (8/7)^(1/16)*(5-y)^(1/16) or x = -((8/7)^(1/16)*(5-y)^(1/16))
x in { (8/7)^(1/16)*(5-y)^(1/16), -((8/7)^(1/16)*(5-y)^(1/16)) }
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