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Sorry forgot your last question:
For these types of question just apply log to both sides so that they become like linear equations:
5^(2x-1) = 2(3^x)
ln(5^(2x-1)) = ln(2(3^x))
(2x-1)*ln5 = ln2 + x*ln3
(2ln5)x - ln5 = ln2 + (ln3)x
(2ln5 - ln3)x = ln2 + ln5
Do the rest using calculator:
x = 1.085990045