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3.1=y+2.8
We move all terms to the left:
3.1-(y+2.8)=0
We get rid of parentheses
-y-2.8+3.1=0
We add all the numbers together, and all the variables
-1y+0.3=0
We move all terms containing y to the left, all other terms to the right
-y=-0.3
y=-0.3/-1
y=0.3/1
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