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w+3w-7=4w-7
We move all terms to the left:
w+3w-7-(4w-7)=0
We add all the numbers together, and all the variables
4w-(4w-7)-7=0
We get rid of parentheses
4w-4w+7-7=0
We add all the numbers together, and all the variables
=0
w=0/1
w=0
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