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23.7-3y=4.5
We move all terms to the left:
23.7-3y-(4.5)=0
We add all the numbers together, and all the variables
-3y+19.2=0
We move all terms containing y to the left, all other terms to the right
-3y=-19.2
y=-19.2/-3
y=6+1/2.5
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