5x-21=7+7x

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Solution for 5x-21=7+7x equation: 



5x-21=7+7x

We move all terms to the left:

5x-21-(7+7x)=0

We add all the numbers together, and all the variables

5x-(7x+7)-21=0

We get rid of parentheses

5x-7x-7-21=0

We add all the numbers together, and all the variables

-2x-28=0

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

-2x=28

x=28/-2

x=-14

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