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