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0.1d+0.25=12.5
We move all terms to the left:
0.1d+0.25-(12.5)=0
We add all the numbers together, and all the variables
0.1d-12.25=0
We move all terms containing d to the left, all other terms to the right
0.1d=12.25
d=12.25/0.1
d=122+0.049999999999999/0.1
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