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-13=w/6-4
We move all terms to the left:
-13-(w/6-4)=0
We get rid of parentheses
-w/6+4-13=0
We multiply all the terms by the denominator
-w+4*6-13*6=0
We add all the numbers together, and all the variables
-1w-54=0
We move all terms containing w to the left, all other terms to the right
-w=54
w=54/-1
w=-54
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