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15.99-9.99d=100
We move all terms to the left:
15.99-9.99d-(100)=0
We add all the numbers together, and all the variables
-9.99d-84.01=0
We move all terms containing d to the left, all other terms to the right
-9.99d=84.01
d=84.01/-9.99
d=-8+3.7522935779816/9.1651376146789
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