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1-3x=31x+12
We move all terms to the left:
1-3x-(31x+12)=0
We get rid of parentheses
-3x-31x-12+1=0
We add all the numbers together, and all the variables
-34x-11=0
We move all terms containing x to the left, all other terms to the right
-34x=11
x=11/-34
x=-11/34
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