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3+.80d=6.75
We move all terms to the left:
3+.80d-(6.75)=0
We add all the numbers together, and all the variables
.80d-3.75=0
We move all terms containing d to the left, all other terms to the right
.80d=3.75
d=3.75/.80
d=4+0.55/.80
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