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4d+1.03=19.31
We move all terms to the left:
4d+1.03-(19.31)=0
We add all the numbers together, and all the variables
4d-18.28=0
We move all terms containing d to the left, all other terms to the right
4d=18.28
d=18.28/4
d=4+1/1.75438596491
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