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-0.5y=19.5
We move all terms to the left:
-0.5y-(19.5)=0
We add all the numbers together, and all the variables
-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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