21^x=7^x+1

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Solution for 21^x=7^x+1 equation: 



21^x=7^x+1

We move all terms to the left:

21^x-(7^x+1)=0

We get rid of parentheses

21^x-7^x-1=0

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

21^x-7^x=1

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