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13+w/6=-2
We move all terms to the left:
13+w/6-(-2)=0
We add all the numbers together, and all the variables
w/6+15=0
We multiply all the terms by the denominator
w+15*6=0
We add all the numbers together, and all the variables
w+90=0
We move all terms containing w to the left, all other terms to the right
w=-90
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