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42=-w/4
We move all terms to the left:
42-(-w/4)=0
We get rid of parentheses
w/4+42=0
We multiply all the terms by the denominator
w+42*4=0
We add all the numbers together, and all the variables
w+168=0
We move all terms containing w to the left, all other terms to the right
w=-168
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