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-5.4=2.1+y/3
We move all terms to the left:
-5.4-(2.1+y/3)=0
We add all the numbers together, and all the variables
-(y/3+2.1)-5.4=0
We get rid of parentheses
-y/3-2.1-5.4=0
We multiply all the terms by the denominator
-y-(2.1)*3-(5.4)*3=0
We add all the numbers together, and all the variables
-1y-22.5=0
We move all terms containing y to the left, all other terms to the right
-y=22.5
y=22.5/-1
y=-22+0.5/1
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