9^-3r=1/81

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Solution for 9^-3r=1/81 equation: 


r in (-oo:+oo)

9^-3*r = 1/81 // - 1/81

9^-3*r-(1/81) = 0

9^-3*r-1/81 = 0

1/729*r-1/81 = 0 // + 1/81

1/729*r = 1/81 // : 1/729

r = 1/81/1/729

r = 9

r = 9

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