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x in (-oo:+oo)
x^4 = 2401/625 // - 2401/625
x^4-(2401/625) = 0
x^4-2401/625 = 0
1*x^4 = 2401/625 // : 1
x^4 = 2401/625
x^4 = 2401/625 // ^ 1/4
abs(x) = 7/5
x = 7/5 or x = -7/5
x in { 7/5, -7/5 }
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