if 3^(x+1) - 3^x = 54 fine the value of x
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^x - 3^(x-1) = 18
3^x - (3^x/3) = 18
Let 3^x = a
a - a/3 = 18
2a = 54; a = 27
3^x = 27
x = 3
x^x = 3^3 = 27
Option 5)
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