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3ⁿ - 3⁻². 3ⁿ - 216 = 0
3ⁿ - 1/9 3ⁿ = 216
misalkan 3ⁿ = x
x - 1/9 x = 216
8/9 x = 216
x = 243
3ⁿ = 243 = 3⁵
n = 5