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4400=y-0.9y
We move all terms to the left:
4400-(y-0.9y)=0
We add all the numbers together, and all the variables
-(+0.1y)+4400=0
We get rid of parentheses
-0.1y+4400=0
We move all terms containing y to the left, all other terms to the right
-0.1y=-4400
y=-4400/-0.1
y=+44000
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