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9y+1-2y=7y+1
We move all terms to the left:
9y+1-2y-(7y+1)=0
We add all the numbers together, and all the variables
7y-(7y+1)+1=0
We get rid of parentheses
7y-7y-1+1=0
We add all the numbers together, and all the variables
=0
y=0/1
y=0
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