7x+21=-21+x

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



7x+21=-21+x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

7x-x+21+21=0

We add all the numbers together, and all the variables

6x+42=0

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

6x=-42

x=-42/6

x=-7

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