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2.5^x=0.087
We move all terms to the left:
2.5^x-(0.087)=0
We add all the numbers together, and all the variables
2.5^x-0.087=0
We move all terms containing x to the left, all other terms to the right
2.5^x=0.087
x=0.087/1
x=0.087
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