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0.35y+0.6(30-y)=0.45(30)
We move all terms to the left:
0.35y+0.6(30-y)-(0.45(30))=0
We add all the numbers together, and all the variables
0.35y+0.6(-1y+30)-(0.453)=0
We add all the numbers together, and all the variables
0.35y+0.6(-1y+30)-0.453=0
We multiply parentheses
0.35y-0.6y+18-0.453=0
We add all the numbers together, and all the variables
-0.25y+17.547=0
We move all terms containing y to the left, all other terms to the right
-0.25y=-17.547
y=-17.547/-0.25
y=70+0.047/0.25
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