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x in (-oo:+oo)
y-4 = (1/5)*x^7 // - (1/5)*x^7
y-((1/5)*x^7)-4 = 0
(-1/5)*x^7+y-4 = 0
-1/5*x^7 = -(y-4) // : -1/5
x^7 = -5*(4-y)
x^7 = -5*(4-y) // ^ 1/7
x = -5^(1/7)*(4-y)^(1/7)
x = -5^(1/7)*(4-y)^(1/7)
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