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1350=45*20+30y
We move all terms to the left:
1350-(45*20+30y)=0
We add all the numbers together, and all the variables
-(30y+900)+1350=0
We get rid of parentheses
-30y-900+1350=0
We add all the numbers together, and all the variables
-30y+450=0
We move all terms containing y to the left, all other terms to the right
-30y=-450
y=-450/-30
y=+15
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