21=4+7x

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Solution for 21=4+7x equation: 



21=4+7x

We move all terms to the left:

21-(4+7x)=0

We add all the numbers together, and all the variables

-(7x+4)+21=0

We get rid of parentheses

-7x-4+21=0

We add all the numbers together, and all the variables

-7x+17=0

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

-7x=-17

x=-17/-7

x=2+3/7

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