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0.03y+0.11(5000-y)=0.42y
We move all terms to the left:
0.03y+0.11(5000-y)-(0.42y)=0
We add all the numbers together, and all the variables
0.03y+0.11(-1y+5000)-(+0.42y)=0
We multiply parentheses
0.03y-0.11y-(+0.42y)+550=0
We get rid of parentheses
0.03y-0.11y-0.42y+550=0
We add all the numbers together, and all the variables
-0.5y+550=0
We move all terms containing y to the left, all other terms to the right
-0.5y=-550
y=-550/-0.5
y=+1100
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