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900=5^x-1
We move all terms to the left:
900-(5^x-1)=0
We get rid of parentheses
-5^x+1+900=0
We add all the numbers together, and all the variables
-5^x+901=0
We move all terms containing x to the left, all other terms to the right
-5^x=-901
x=-901/1
x=-901
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