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18=3x+x+6
We move all terms to the left:
18-(3x+x+6)=0
We add all the numbers together, and all the variables
-(4x+6)+18=0
We get rid of parentheses
-4x-6+18=0
We add all the numbers together, and all the variables
-4x+12=0
We move all terms containing x to the left, all other terms to the right
-4x=-12
x=-12/-4
x=+3
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