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19=-4+w
We move all terms to the left:
19-(-4+w)=0
We add all the numbers together, and all the variables
-(w-4)+19=0
We get rid of parentheses
-w+4+19=0
We add all the numbers together, and all the variables
-1w+23=0
We move all terms containing w to the left, all other terms to the right
-w=-23
w=-23/-1
w=+23
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