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6.42-10d=2.8
We move all terms to the left:
6.42-10d-(2.8)=0
We add all the numbers together, and all the variables
-10d+3.62=0
We move all terms containing d to the left, all other terms to the right
-10d=-3.62
d=-3.62/-10
d=2.2345679012346/6.1728395061728
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