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x in (-oo:+oo)
y = (7/8)*x^8-6 // - (7/8)*x^8-6
y-((7/8)*x^8)+6 = 0
(-7/8)*x^8+y+6 = 0
-7/8*x^8 = -(y+6) // : -7/8
x^8 = 8/7*(y+6)
x^8 = 8/7*(y+6) // ^ 1/8
abs(x) = (8/7)^(1/8)*(y+6)^(1/8)
x = (8/7)^(1/8)*(y+6)^(1/8) or x = -((8/7)^(1/8)*(y+6)^(1/8))
x in { (8/7)^(1/8)*(y+6)^(1/8), -((8/7)^(1/8)*(y+6)^(1/8)) }
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