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13x-2=31x+6
We move all terms to the left:
13x-2-(31x+6)=0
We get rid of parentheses
13x-31x-6-2=0
We add all the numbers together, and all the variables
-18x-8=0
We move all terms containing x to the left, all other terms to the right
-18x=8
x=8/-18
x=-4/9
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