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-18=2w-4
We move all terms to the left:
-18-(2w-4)=0
We get rid of parentheses
-2w+4-18=0
We add all the numbers together, and all the variables
-2w-14=0
We move all terms containing w to the left, all other terms to the right
-2w=14
w=14/-2
w=-7
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