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9.9=2.5y+8.8
We move all terms to the left:
9.9-(2.5y+8.8)=0
We get rid of parentheses
-2.5y-8.8+9.9=0
We add all the numbers together, and all the variables
-2.5y+1.1=0
We move all terms containing y to the left, all other terms to the right
-2.5y=-1.1
y=-1.1/-2.5
y=1/2.2727272727273
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