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1.15^x+2=12.5
We move all terms to the left:
1.15^x+2-(12.5)=0
We add all the numbers together, and all the variables
1.15^x-10.5=0
We move all terms containing x to the left, all other terms to the right
1.15^x=10.5
x=10.5/1
x=10.5
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