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-20-12y=20-20y
We move all terms to the left:
-20-12y-(20-20y)=0
We add all the numbers together, and all the variables
-12y-(-20y+20)-20=0
We get rid of parentheses
-12y+20y-20-20=0
We add all the numbers together, and all the variables
8y-40=0
We move all terms containing y to the left, all other terms to the right
8y=40
y=40/8
y=5
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