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-31+x=14-2x
We move all terms to the left:
-31+x-(14-2x)=0
We add all the numbers together, and all the variables
x-(-2x+14)-31=0
We get rid of parentheses
x+2x-14-31=0
We add all the numbers together, and all the variables
3x-45=0
We move all terms containing x to the left, all other terms to the right
3x=45
x=45/3
x=15
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