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3x+6=12+13x
We move all terms to the left:
3x+6-(12+13x)=0
We add all the numbers together, and all the variables
3x-(13x+12)+6=0
We get rid of parentheses
3x-13x-12+6=0
We add all the numbers together, and all the variables
-10x-6=0
We move all terms containing x to the left, all other terms to the right
-10x=6
x=6/-10
x=-3/5
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