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-3.7=w-1.9
We move all terms to the left:
-3.7-(w-1.9)=0
We get rid of parentheses
-w+1.9-3.7=0
We add all the numbers together, and all the variables
-1w-1.8=0
We move all terms containing w to the left, all other terms to the right
-w=1.8
w=1.8/-1
w=-1+0.8/1
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