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y in (-oo:+oo)
((5*7)/5)*y^4 = 2 // - 2
((5*7)/5)*y^4-2 = 0
7*y^4 = 2 // : 7
y^4 = 2/7
y^4 = 2/7 // ^ 1/4
abs(y) = (2/7)^(1/4)
y = (2/7)^(1/4) or y = -(2/7)^(1/4)
y in { (2/7)^(1/4), -(2/7)^(1/4) }
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