7x-9=21+2x

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Solution for 7x-9=21+2x equation: 



7x-9=21+2x

We move all terms to the left:

7x-9-(21+2x)=0

We add all the numbers together, and all the variables

7x-(2x+21)-9=0

We get rid of parentheses

7x-2x-21-9=0

We add all the numbers together, and all the variables

5x-30=0

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

5x=30

x=30/5

x=6

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