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