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.1O=0.2(O+2)
We move all terms to the left:
.1O-(0.2(O+2))=0
We calculate terms in parentheses: -(0.2(O+2)), so:We get rid of parentheses
0.2(O+2)
We multiply parentheses
0.2O+0.4
Back to the equation:
-(0.2O+0.4)
.1O-0.2O-0.4=0
We add all the numbers together, and all the variables
-0.1O-0.4=0
We move all terms containing O to the left, all other terms to the right
-0.1O=0.4
O=0.4/-0.1
O=-4
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