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2(4=9w)
We move all terms to the left:
2(4-(9w))=0
We add all the numbers together, and all the variables
2(-9w+4)=0
We multiply parentheses
-18w+8=0
We move all terms containing w to the left, all other terms to the right
-18w=-8
w=-8/-18
w=4/9
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