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13w=45+4w
We move all terms to the left:
13w-(45+4w)=0
We add all the numbers together, and all the variables
13w-(4w+45)=0
We get rid of parentheses
13w-4w-45=0
We add all the numbers together, and all the variables
9w-45=0
We move all terms containing w to the left, all other terms to the right
9w=45
w=45/9
w=5
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