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1.8+2d=4.38
We move all terms to the left:
1.8+2d-(4.38)=0
We add all the numbers together, and all the variables
2d-2.58=0
We move all terms containing d to the left, all other terms to the right
2d=2.58
d=2.58/2
d=1+0.58/2
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