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.520d+14.7=31
We move all terms to the left:
.520d+14.7-(31)=0
We add all the numbers together, and all the variables
.520d-16.3=0
We move all terms containing d to the left, all other terms to the right
.520d=16.3
d=16.3/.520
d=31+0.18/.520
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