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43=15-w
We move all terms to the left:
43-(15-w)=0
We add all the numbers together, and all the variables
-(-1w+15)+43=0
We get rid of parentheses
1w-15+43=0
We add all the numbers together, and all the variables
w+28=0
We move all terms containing w to the left, all other terms to the right
w=-28
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