
Carol H. answered 08/12/14
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Experienced Mathematics Tutor w/ Master's Degree in Math
I'm assuming your problem is 125 = 255x-3
If so, 125 = 53 and 255x-3 = 52(5x-3)
53 = 510x-6
When the bases are the same, the exponents equal each other.
Thus, 3 = 10x-6
9 = 10x
9 = x
10