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-3x-1=3x-31
We move all terms to the left:
-3x-1-(3x-31)=0
We get rid of parentheses
-3x-3x+31-1=0
We add all the numbers together, and all the variables
-6x+30=0
We move all terms containing x to the left, all other terms to the right
-6x=-30
x=-30/-6
x=+5
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