15=4^x-1

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Solution for 15=4^x-1 equation: 



15=4^x-1

We move all terms to the left:

15-(4^x-1)=0

We get rid of parentheses

-4^x+1+15=0

We add all the numbers together, and all the variables

-4^x+16=0

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

-4^x=-16

x=-16/1

x=-16

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