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13+15w=3w-w+4
We move all terms to the left:
13+15w-(3w-w+4)=0
We add all the numbers together, and all the variables
15w-(2w+4)+13=0
We get rid of parentheses
15w-2w-4+13=0
We add all the numbers together, and all the variables
13w+9=0
We move all terms containing w to the left, all other terms to the right
13w=-9
w=-9/13
w=-9/13
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