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-12=3Y+20
We move all terms to the left:
-12-(3Y+20)=0
We get rid of parentheses
-3Y-20-12=0
We add all the numbers together, and all the variables
-3Y-32=0
We move all terms containing Y to the left, all other terms to the right
-3Y=32
Y=32/-3
Y=-10+2/3
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