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2.9^x-4=8.1
We move all terms to the left:
2.9^x-4-(8.1)=0
We add all the numbers together, and all the variables
2.9^x-12.1=0
We move all terms containing x to the left, all other terms to the right
2.9^x=12.1
x=12.1/1
x=12.1
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