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.5(O+6)=-3
We move all terms to the left:
.5(O+6)-(-3)=0
We add all the numbers together, and all the variables
.5(O+6)+3=0
We multiply parentheses
0.5O+3+3=0
We add all the numbers together, and all the variables
0.5O+6=0
We move all terms containing O to the left, all other terms to the right
0.5O=-6
O=-6/0.5
O=-12
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