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Source: — Problem Solving |
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by kstv » Wed May 05, 2010 8:13 pm
5^x - 5^(x-3) = (125-1)5^y
5^x - 5^(x-3) = (5^3 - 1)5^y
5^x - 5^ (x-3) = 5^(3+y) - 5^y
comparing the exponents
y = x-3 or x = 3+y
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