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49=4w+3w
We move all terms to the left:
49-(4w+3w)=0
We add all the numbers together, and all the variables
-(+7w)+49=0
We get rid of parentheses
-7w+49=0
We move all terms containing w to the left, all other terms to the right
-7w=-49
w=-49/-7
w=+7
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