7x+12=21+x

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Solution for 7x+12=21+x equation: 



7x+12=21+x

We move all terms to the left:

7x+12-(21+x)=0

We add all the numbers together, and all the variables

7x-(x+21)+12=0

We get rid of parentheses

7x-x-21+12=0

We add all the numbers together, and all the variables

6x-9=0

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

6x=9

x=9/6

x=1+1/2

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