18=9x+3x

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Solution for 18=9x+3x equation: 



18=9x+3x

We move all terms to the left:

18-(9x+3x)=0

We add all the numbers together, and all the variables

-(+12x)+18=0

We get rid of parentheses

-12x+18=0

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

-12x=-18

x=-18/-12

x=1+1/2

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