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8.1y+2.3=5.1y-3.1
We move all terms to the left:
8.1y+2.3-(5.1y-3.1)=0
We get rid of parentheses
8.1y-5.1y+3.1+2.3=0
We add all the numbers together, and all the variables
3y+5.4=0
We move all terms containing y to the left, all other terms to the right
3y=-5.4
y=-5.4/3
y=-1+2.4/3
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