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