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-12.8w+9.42=-13.4w
We move all terms to the left:
-12.8w+9.42-(-13.4w)=0
We get rid of parentheses
-12.8w+13.4w+9.42=0
We add all the numbers together, and all the variables
0.6w+9.42=0
We move all terms containing w to the left, all other terms to the right
0.6w=-9.42
w=-9.42/0.6
w=-15+0.42/0.6
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