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4w=45-w
We move all terms to the left:
4w-(45-w)=0
We add all the numbers together, and all the variables
4w-(-1w+45)=0
We get rid of parentheses
4w+1w-45=0
We add all the numbers together, and all the variables
5w-45=0
We move all terms containing w to the left, all other terms to the right
5w=45
w=45/5
w=9
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