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13d+1.95=85.65
We move all terms to the left:
13d+1.95-(85.65)=0
We add all the numbers together, and all the variables
13d-83.7=0
We move all terms containing d to the left, all other terms to the right
13d=83.7
d=83.7/13
d=6+3.35294117647/7.64705882353
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