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-7.5+5.5y=6.4
We move all terms to the left:
-7.5+5.5y-(6.4)=0
We add all the numbers together, and all the variables
5.5y-13.9=0
We move all terms containing y to the left, all other terms to the right
5.5y=13.9
y=13.9/5.5
y=2+2.9/5.5
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