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0.25d+0.75=3
We move all terms to the left:
0.25d+0.75-(3)=0
We add all the numbers together, and all the variables
0.25d-2.25=0
We move all terms containing d to the left, all other terms to the right
0.25d=2.25
d=2.25/0.25
d=9
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