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(1/7)*x^4-y+1 = 0
1/7*x^4 = -(1-y) // : 1/7
x^4 = 7*(y-1)
x^4 = 7*(y-1) // ^ 1/4
abs(x) = 7^(1/4)*(y-1)^(1/4)
x = 7^(1/4)*(y-1)^(1/4) or x = -(7^(1/4)*(y-1)^(1/4))
x in { 7^(1/4)*(y-1)^(1/4), -(7^(1/4)*(y-1)^(1/4)) }
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