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3y=45-6y
We move all terms to the left:
3y-(45-6y)=0
We add all the numbers together, and all the variables
3y-(-6y+45)=0
We get rid of parentheses
3y+6y-45=0
We add all the numbers together, and all the variables
9y-45=0
We move all terms containing y to the left, all other terms to the right
9y=45
y=45/9
y=5
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