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9w-3.5=6.4
We move all terms to the left:
9w-3.5-(6.4)=0
We add all the numbers together, and all the variables
9w-9.9=0
We move all terms containing w to the left, all other terms to the right
9w=9.9
w=9.9/9
w=1+0.9/9
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