12+21=2x+x

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Solution for 12+21=2x+x equation: 



12+21=2x+x

We move all terms to the left:

12+21-(2x+x)=0

We add all the numbers together, and all the variables

-(+3x)+12+21=0

We add all the numbers together, and all the variables

-(+3x)+33=0

We get rid of parentheses

-3x+33=0

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

-3x=-33

x=-33/-3

x=+11

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