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9=3+12x
We move all terms to the left:
9-(3+12x)=0
We add all the numbers together, and all the variables
-(12x+3)+9=0
We get rid of parentheses
-12x-3+9=0
We add all the numbers together, and all the variables
-12x+6=0
We move all terms containing x to the left, all other terms to the right
-12x=-6
x=-6/-12
x=1/2
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