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5d-3.3=7.2
We move all terms to the left:
5d-3.3-(7.2)=0
We add all the numbers together, and all the variables
5d-10.5=0
We move all terms containing d to the left, all other terms to the right
5d=10.5
d=10.5/5
d=2+0.5/5
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