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9+(7+w)=(9+7)+w
We move all terms to the left:
9+(7+w)-((9+7)+w)=0
We add all the numbers together, and all the variables
(w+7)-(16+w)+9=0
We get rid of parentheses
w-w+7-16+9=0
We add all the numbers together, and all the variables
=0
w=0/1
w=0
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