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-1x+3=12x+1
We move all terms to the left:
-1x+3-(12x+1)=0
We get rid of parentheses
-1x-12x-1+3=0
We add all the numbers together, and all the variables
-13x+2=0
We move all terms containing x to the left, all other terms to the right
-13x=-2
x=-2/-13
x=2/13
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