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5.4=y/15=2.3

We move all terms to the left:

5.4-(y/15)=0

We add all the numbers together, and all the variables

-(+y/15)+5.4=0

We get rid of parentheses

-y/15+5.4=0

We multiply all the terms by the denominator

-y+(5.4)*15=0

We add all the numbers together, and all the variables

-1y+81=0

We move all terms containing y to the left, all other terms to the right

-y=-81

y=-81/-1

y=+81

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