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0.1y+0.6(15-y)=6.5
We move all terms to the left:
0.1y+0.6(15-y)-(6.5)=0
We add all the numbers together, and all the variables
0.1y+0.6(-1y+15)-(6.5)=0
We add all the numbers together, and all the variables
0.1y+0.6(-1y+15)-6.5=0
We multiply parentheses
0.1y-0.6y+9-6.5=0
We add all the numbers together, and all the variables
-0.5y+2.5=0
We move all terms containing y to the left, all other terms to the right
-0.5y=-2.5
y=-2.5/-0.5
y=+5
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