1,3^x = 13000
log1,3^x = log (1,3 * 10^4)
xlog1,3 = log1,3 + log10^4
xlog1,3 - log1,3 = 4log10
log1,3(x - 1) = 4
x - 1 = 4 / log1,3
x = 4 / log1,3 + 1
x = (4 + log1,3)/ log1,3
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1,3^x = 13000
log1,3^x = log (1,3 * 10^4)
xlog1,3 = log1,3 + log10^4
xlog1,3 - log1,3 = 4log10
log1,3(x - 1) = 4
x - 1 = 4 / log1,3
x = 4 / log1,3 + 1
x = (4 + log1,3)/ log1,3