r4/3=81

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Solution for r4/3=81 equation: 


r in (-oo:+oo)

(r^4)/3 = 81 // - 81

(r^4)/3-81 = 0

1/3*r^4 = 81 // : 1/3

r^4 = 243

r^4 = 243 // ^ 1/4

abs(r) = 3*3^(1/4)

r = 3*3^(1/4) or r = -(3*3^(1/4))

r in { 3*3^(1/4), -(3*3^(1/4)) }

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