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d-2.16=3.9d
We move all terms to the left:
d-2.16-(3.9d)=0
We add all the numbers together, and all the variables
d-(+3.9d)-2.16=0
We get rid of parentheses
d-3.9d-2.16=0
We add all the numbers together, and all the variables
-2.9d-2.16=0
We move all terms containing d to the left, all other terms to the right
-2.9d=2.16
d=2.16/-2.9
d=-1/1.3425925925926
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