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1.5d+3=4.5
We move all terms to the left:
1.5d+3-(4.5)=0
We add all the numbers together, and all the variables
1.5d-1.5=0
We move all terms containing d to the left, all other terms to the right
1.5d=1.5
d=1.5/1.5
d=1
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