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1.28-8.6w+0.4=-8.3w+4.2
We move all terms to the left:
1.28-8.6w+0.4-(-8.3w+4.2)=0
We add all the numbers together, and all the variables
-8.6w-(-8.3w+4.2)+1.68=0
We get rid of parentheses
-8.6w+8.3w-4.2+1.68=0
We add all the numbers together, and all the variables
-0.3w-2.52=0
We move all terms containing w to the left, all other terms to the right
-0.3w=2.52
w=2.52/-0.3
w=-8+0.12/0.3
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