r4=1/81

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Solution for r4=1/81 equation: 


r in (-oo:+oo)

r^4 = 1/81 // - 1/81

r^4-(1/81) = 0

r^4-1/81 = 0

1*r^4 = 1/81 // : 1

r^4 = 1/81

r^4 = 1/81 // ^ 1/4

abs(r) = 1/3

r = 1/3 or r = -1/3

r in { 1/3, -1/3 }

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