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-15.9=3.1+8w
We move all terms to the left:
-15.9-(3.1+8w)=0
We add all the numbers together, and all the variables
-(8w+3.1)-15.9=0
We get rid of parentheses
-8w-3.1-15.9=0
We add all the numbers together, and all the variables
-8w-19=0
We move all terms containing w to the left, all other terms to the right
-8w=19
w=19/-8
w=-2+3/8
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