3.9^x-9=15.21

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Solution for 3.9^x-9=15.21 equation: 



3.9^x-9=15.21

We move all terms to the left:

3.9^x-9-(15.21)=0

We add all the numbers together, and all the variables

3.9^x-24.21=0

We move all terms containing x to the left, all other terms to the right

3.9^x=24.21

x=24.21/1

x=24.21

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