21=1+7x

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Solution for 21=1+7x equation: 



21=1+7x

We move all terms to the left:

21-(1+7x)=0

We add all the numbers together, and all the variables

-(7x+1)+21=0

We get rid of parentheses

-7x-1+21=0

We add all the numbers together, and all the variables

-7x+20=0

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

-7x=-20

x=-20/-7

x=2+6/7

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