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27=4.5-7.5y
We move all terms to the left:
27-(4.5-7.5y)=0
We add all the numbers together, and all the variables
-(-7.5y+4.5)+27=0
We get rid of parentheses
7.5y-4.5+27=0
We add all the numbers together, and all the variables
7.5y+22.5=0
We move all terms containing y to the left, all other terms to the right
7.5y=-22.5
y=-22.5/7.5
y=-3
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