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.7O-1.4=-3.5
We move all terms to the left:
.7O-1.4-(-3.5)=0
We add all the numbers together, and all the variables
.7O+2.1=0
We move all terms containing O to the left, all other terms to the right
.7O=-2.1
O=-2.1/.7
O=-3+4.4408920985006E-16/.7
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