5x-7=21+x

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



5x-7=21+x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

5x-x-21-7=0

We add all the numbers together, and all the variables

4x-28=0

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

4x=28

x=28/4

x=7

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