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3+6x=12+x
We move all terms to the left:
3+6x-(12+x)=0
We add all the numbers together, and all the variables
6x-(x+12)+3=0
We get rid of parentheses
6x-x-12+3=0
We add all the numbers together, and all the variables
5x-9=0
We move all terms containing x to the left, all other terms to the right
5x=9
x=9/5
x=1+4/5
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