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13=2w+7
We move all terms to the left:
13-(2w+7)=0
We get rid of parentheses
-2w-7+13=0
We add all the numbers together, and all the variables
-2w+6=0
We move all terms containing w to the left, all other terms to the right
-2w=-6
w=-6/-2
w=+3
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