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3=6O+21
We move all terms to the left:
3-(6O+21)=0
We get rid of parentheses
-6O-21+3=0
We add all the numbers together, and all the variables
-6O-18=0
We move all terms containing O to the left, all other terms to the right
-6O=18
O=18/-6
O=-3
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