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3.5y-31.5-1.9y=13.5
We move all terms to the left:
3.5y-31.5-1.9y-(13.5)=0
We add all the numbers together, and all the variables
1.6y-45=0
We move all terms containing y to the left, all other terms to the right
1.6y=45
y=45/1.6
y=28+0.2/1.6
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