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15=25(5)^x-1
We move all terms to the left:
15-(25(5)^x-1)=0
We get rid of parentheses
-255^x+1+15=0
We add all the numbers together, and all the variables
-255^x+16=0
We move all terms containing x to the left, all other terms to the right
-255^x=-16
x=-16/1
x=-16
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