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0.66666666666y+12=0.16666666666y-9
We move all terms to the left:
0.66666666666y+12-(0.16666666666y-9)=0
We get rid of parentheses
0.66666666666y-0.16666666666y+9+12=0
We add all the numbers together, and all the variables
0.5y+21=0
We move all terms containing y to the left, all other terms to the right
0.5y=-21
y=-21/0.5
y=-42
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