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w+(8+w)*2=13
We move all terms to the left:
w+(8+w)*2-(13)=0
We add all the numbers together, and all the variables
w+(w+8)*2-13=0
We multiply parentheses
w+2w+16-13=0
We add all the numbers together, and all the variables
3w+3=0
We move all terms containing w to the left, all other terms to the right
3w=-3
w=-3/3
w=-1
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