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2.5^x=0.4
We move all terms to the left:
2.5^x-(0.4)=0
We add all the numbers together, and all the variables
2.5^x-0.4=0
We move all terms containing x to the left, all other terms to the right
2.5^x=0.4
x=0.4/1
x=0.4
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