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11.2d-12.72=13.6d
We move all terms to the left:
11.2d-12.72-(13.6d)=0
We add all the numbers together, and all the variables
11.2d-(+13.6d)-12.72=0
We get rid of parentheses
11.2d-13.6d-12.72=0
We add all the numbers together, and all the variables
-2.4d-12.72=0
We move all terms containing d to the left, all other terms to the right
-2.4d=12.72
d=12.72/-2.4
d=-5+0.72/2.4
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