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-20=-7-13y
We move all terms to the left:
-20-(-7-13y)=0
We add all the numbers together, and all the variables
-(-13y-7)-20=0
We get rid of parentheses
13y+7-20=0
We add all the numbers together, and all the variables
13y-13=0
We move all terms containing y to the left, all other terms to the right
13y=13
y=13/13
y=1
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