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(4y-9)=y
We move all terms to the left:
(4y-9)-(y)=0
We add all the numbers together, and all the variables
-1y+(4y-9)=0
We get rid of parentheses
-1y+4y-9=0
We add all the numbers together, and all the variables
3y-9=0
We move all terms containing y to the left, all other terms to the right
3y=9
y=9/3
y=3
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