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0.06y+0.1(100-y)=6.8
We move all terms to the left:
0.06y+0.1(100-y)-(6.8)=0
We add all the numbers together, and all the variables
0.06y+0.1(-1y+100)-(6.8)=0
We add all the numbers together, and all the variables
0.06y+0.1(-1y+100)-6.8=0
We multiply parentheses
0.06y-0.1y+10-6.8=0
We add all the numbers together, and all the variables
-0.04y+3.2=0
We move all terms containing y to the left, all other terms to the right
-0.04y=-3.2
y=-3.2/-0.04
y=+80
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