18=x+12+x

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Solution for 18=x+12+x equation: 



18=x+12+x

We move all terms to the left:

18-(x+12+x)=0

We add all the numbers together, and all the variables

-(2x+12)+18=0

We get rid of parentheses

-2x-12+18=0

We add all the numbers together, and all the variables

-2x+6=0

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

-2x=-6

x=-6/-2

x=+3

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