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19.5=0.5y
We move all terms to the left:
19.5-(0.5y)=0
We add all the numbers together, and all the variables
-(+0.5y)+19.5=0
We get rid of parentheses
-0.5y+19.5=0
We move all terms containing y to the left, all other terms to the right
-0.5y=-19.5
y=-19.5/-0.5
y=+39
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