12+9=x-3

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Solution for 12+9=x-3 equation: 



12+9=x-3

We move all terms to the left:

12+9-(x-3)=0

We add all the numbers together, and all the variables

-(x-3)+21=0

We get rid of parentheses

-x+3+21=0

We add all the numbers together, and all the variables

-1x+24=0

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

-x=-24

x=-24/-1

x=+24

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