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13+w=11w-7
We move all terms to the left:
13+w-(11w-7)=0
We get rid of parentheses
w-11w+7+13=0
We add all the numbers together, and all the variables
-10w+20=0
We move all terms containing w to the left, all other terms to the right
-10w=-20
w=-20/-10
w=+2
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