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5^r/2=125
We move all terms to the left:
5^r/2-(125)=0
We multiply all the terms by the denominator
5^r-125*2=0
We add all the numbers together, and all the variables
5^r-250=0
We move all terms containing r to the left, all other terms to the right
5^r=250
r=250/1
r=250
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