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300=2*100+2w
We move all terms to the left:
300-(2*100+2w)=0
We add all the numbers together, and all the variables
-(2w+200)+300=0
We get rid of parentheses
-2w-200+300=0
We add all the numbers together, and all the variables
-2w+100=0
We move all terms containing w to the left, all other terms to the right
-2w=-100
w=-100/-2
w=+50
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