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.5d-6.8=12.4
We move all terms to the left:
.5d-6.8-(12.4)=0
We add all the numbers together, and all the variables
.5d-19.2=0
We move all terms containing d to the left, all other terms to the right
.5d=19.2
d=19.2/.5
d=38+0.2/.5
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