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y=4y-45
We move all terms to the left:
y-(4y-45)=0
We get rid of parentheses
y-4y+45=0
We add all the numbers together, and all the variables
-3y+45=0
We move all terms containing y to the left, all other terms to the right
-3y=-45
y=-45/-3
y=+15
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