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15+w=2w-5+20-w
We move all terms to the left:
15+w-(2w-5+20-w)=0
We add all the numbers together, and all the variables
w-(w+15)+15=0
We get rid of parentheses
w-w-15+15=0
We add all the numbers together, and all the variables
=0
w=0/1
w=0
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