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180=-w+90
We move all terms to the left:
180-(-w+90)=0
We add all the numbers together, and all the variables
-(-1w+90)+180=0
We get rid of parentheses
1w-90+180=0
We add all the numbers together, and all the variables
w+90=0
We move all terms containing w to the left, all other terms to the right
w=-90
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