21=8x-1

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Solution for 21=8x-1 equation: 



21=8x-1

We move all terms to the left:

21-(8x-1)=0

We get rid of parentheses

-8x+1+21=0

We add all the numbers together, and all the variables

-8x+22=0

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

-8x=-22

x=-22/-8

x=2+3/4

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