Can You Solve This Challenging Exponential Equation?

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There is one problem that I can't seem to figure out how to do, and I was wondering if someone could help me. Problem: 5(2)^3x - 4 = 13 . Most exponential equations I can solve, but its the power of 3x that's messing me up.
 
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As always, the first question is "What have you tried so far ?", so that we can see exactly where you need help. :)
 
And another question:How do u usually solve exponential equations and why do you think that the method wouldn't apply here...?

Daniel.
 

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