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-7y-(+2y)=
We move all terms to the left:
-7y-(+2y)-()=0
We add all the numbers together, and all the variables
-7y-(+2y)=0
We get rid of parentheses
-7y-2y=0
We add all the numbers together, and all the variables
-9y=0
y=0/-9
y=0
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