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## Homework Statement

3 - 3^(x+1) < 5^x - 15^x

3(1-3^x) < 5^x(1-3^x)

Do I have to impose 1-3^x > 0 ?

It results x<0 and x>log(5,3) but book has written 0 < x < log(5,3) where did I wrong ?