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y in (-oo:+oo)
4/7 = y^14 // - y^14
4/7-y^14 = 0
-1*y^14 = -4/7 // : -1
y^14 = 4/7
y^14 = 4/7 // ^ 1/14
abs(y) = (4/7)^(1/14)
y = (4/7)^(1/14) or y = -(4/7)^(1/14)
y in { (4/7)^(1/14), -(4/7)^(1/14) }
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