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12-4x=x+13
We move all terms to the left:
12-4x-(x+13)=0
We get rid of parentheses
-4x-x-13+12=0
We add all the numbers together, and all the variables
-5x-1=0
We move all terms containing x to the left, all other terms to the right
-5x=1
x=1/-5
x=-1/5
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