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218=131-w
We move all terms to the left:
218-(131-w)=0
We add all the numbers together, and all the variables
-(-1w+131)+218=0
We get rid of parentheses
1w-131+218=0
We add all the numbers together, and all the variables
w+87=0
We move all terms containing w to the left, all other terms to the right
w=-87
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