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3d-3.4=12.2
We move all terms to the left:
3d-3.4-(12.2)=0
We add all the numbers together, and all the variables
3d-15.6=0
We move all terms containing d to the left, all other terms to the right
3d=15.6
d=15.6/3
d=5+0.6/3
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