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3x-5=12x+31
We move all terms to the left:
3x-5-(12x+31)=0
We get rid of parentheses
3x-12x-31-5=0
We add all the numbers together, and all the variables
-9x-36=0
We move all terms containing x to the left, all other terms to the right
-9x=36
x=36/-9
x=-4
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