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.3(15)+0.05O=0.2(O+15)
We move all terms to the left:
.3(15)+0.05O-(0.2(O+15))=0
We add all the numbers together, and all the variables
0.05O-(0.2(O+15))+0.315=0
We calculate terms in parentheses: -(0.2(O+15)), so:We get rid of parentheses
0.2(O+15)
We multiply parentheses
0.2O+3
Back to the equation:
-(0.2O+3)
0.05O-0.2O-3+0.315=0
We add all the numbers together, and all the variables
-0.15O-2.685=0
We move all terms containing O to the left, all other terms to the right
-0.15O=2.685
O=2.685/-0.15
O=-17+0.135/0.15
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