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2(5^x-1)=250
We move all terms to the left:
2(5^x-1)-(250)=0
We multiply parentheses
10x-2-250=0
We add all the numbers together, and all the variables
10x-252=0
We move all terms containing x to the left, all other terms to the right
10x=252
x=252/10
x=25+1/5
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