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2x-12x=+31
We move all terms to the left:
2x-12x-(+31)=0
We add all the numbers together, and all the variables
2x-12x-31=0
We add all the numbers together, and all the variables
-10x-31=0
We move all terms containing x to the left, all other terms to the right
-10x=31
x=31/-10
x=-3+1/10
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