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2.15d+3.12=72
We move all terms to the left:
2.15d+3.12-(72)=0
We add all the numbers together, and all the variables
2.15d-68.88=0
We move all terms containing d to the left, all other terms to the right
2.15d=68.88
d=68.88/2.15
d=32+0.079999999999998/2.15
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