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y=100+0.9y+200
We move all terms to the left:
y-(100+0.9y+200)=0
We add all the numbers together, and all the variables
y-(0.9y+300)=0
We get rid of parentheses
y-0.9y-300=0
We add all the numbers together, and all the variables
0.1y-300=0
We move all terms containing y to the left, all other terms to the right
0.1y=300
y=300/0.1
y=3000
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