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y=1100+.8y
We move all terms to the left:
y-(1100+.8y)=0
We add all the numbers together, and all the variables
y-(.8y+1100)=0
We get rid of parentheses
y-.8y-1100=0
We add all the numbers together, and all the variables
0.2y-1100=0
We move all terms containing y to the left, all other terms to the right
0.2y=1100
y=1100/0.2
y=5500
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