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-13w+-4w-(-15w)-3w=-20
We move all terms to the left:
-13w+-4w-(-15w)-3w-(-20)=0
We add all the numbers together, and all the variables
-20w-(-15w)+20=0
We get rid of parentheses
-20w+15w+20=0
We add all the numbers together, and all the variables
-5w+20=0
We move all terms containing w to the left, all other terms to the right
-5w=-20
w=-20/-5
w=+4
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