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On P3-5A - Approximately how many years will it take for the account to reach $25,000?

I see

25,000 = 10,000(1+0.07)n

(1.07)n = 25,000 / 10,000

(1.07n) = 2.5

n*ln(2.5)/ln(1.07)

n= 13.54 years

I don't understand how n equals 13.54.

25,000 / 10,000 = 2.5

Then 2.5 / 1.07 = 2.3364485981308411214953271028037