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0.06y+0.14(3000-y)=0.42y
We move all terms to the left:
0.06y+0.14(3000-y)-(0.42y)=0
We add all the numbers together, and all the variables
0.06y+0.14(-1y+3000)-(+0.42y)=0
We multiply parentheses
0.06y-0.14y-(+0.42y)+420=0
We get rid of parentheses
0.06y-0.14y-0.42y+420=0
We add all the numbers together, and all the variables
-0.5y+420=0
We move all terms containing y to the left, all other terms to the right
-0.5y=-420
y=-420/-0.5
y=+840
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