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-18w=4-20w
We move all terms to the left:
-18w-(4-20w)=0
We add all the numbers together, and all the variables
-18w-(-20w+4)=0
We get rid of parentheses
-18w+20w-4=0
We add all the numbers together, and all the variables
2w-4=0
We move all terms containing w to the left, all other terms to the right
2w=4
w=4/2
w=2
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