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-4y=5y-9y
We move all terms to the left:
-4y-(5y-9y)=0
We add all the numbers together, and all the variables
-4y-(-4y)=0
We get rid of parentheses
-4y+4y=0
We add all the numbers together, and all the variables
=0
y=0/1
y=0
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