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31=16-x
We move all terms to the left:
31-(16-x)=0
We add all the numbers together, and all the variables
-(-1x+16)+31=0
We get rid of parentheses
1x-16+31=0
We add all the numbers together, and all the variables
x+15=0
We move all terms containing x to the left, all other terms to the right
x=-15
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