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d/3+2.15=4.05
We move all terms to the left:
d/3+2.15-(4.05)=0
We add all the numbers together, and all the variables
d/3-1.9=0
We multiply all the terms by the denominator
d-(1.9)*3=0
We add all the numbers together, and all the variables
d-5.7=0
We move all terms containing d to the left, all other terms to the right
d=5.7
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