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45=2y+7y
We move all terms to the left:
45-(2y+7y)=0
We add all the numbers together, and all the variables
-(+9y)+45=0
We get rid of parentheses
-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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