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.75(O-12)=-6
We move all terms to the left:
.75(O-12)-(-6)=0
We add all the numbers together, and all the variables
.75(O-12)+6=0
We multiply parentheses
0.75O-9+6=0
We add all the numbers together, and all the variables
0.75O-3=0
We move all terms containing O to the left, all other terms to the right
0.75O=3
O=3/0.75
O=4
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