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2w+8.9=13.8
We move all terms to the left:
2w+8.9-(13.8)=0
We add all the numbers together, and all the variables
2w-4.9=0
We move all terms containing w to the left, all other terms to the right
2w=4.9
w=4.9/2
w=2+0.9/2
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