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15=11+w
We move all terms to the left:
15-(11+w)=0
We add all the numbers together, and all the variables
-(w+11)+15=0
We get rid of parentheses
-w-11+15=0
We add all the numbers together, and all the variables
-1w+4=0
We move all terms containing w to the left, all other terms to the right
-w=-4
w=-4/-1
w=+4
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