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-15.9=y/9-3.1
We move all terms to the left:
-15.9-(y/9-3.1)=0
We get rid of parentheses
-y/9+3.1-15.9=0
We multiply all the terms by the denominator
-y+(3.1)*9-(15.9)*9=0
We add all the numbers together, and all the variables
-1y-115.2=0
We move all terms containing y to the left, all other terms to the right
-y=115.2
y=115.2/-1
y=-115+0.2/1
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