21=17+7x

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Solution for 21=17+7x equation: 



21=17+7x

We move all terms to the left:

21-(17+7x)=0

We add all the numbers together, and all the variables

-(7x+17)+21=0

We get rid of parentheses

-7x-17+21=0

We add all the numbers together, and all the variables

-7x+4=0

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

-7x=-4

x=-4/-7

x=4/7

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