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40d+15.25d+9.50d=213.25
We move all terms to the left:
40d+15.25d+9.50d-(213.25)=0
We add all the numbers together, and all the variables
64.75d-213.25=0
We move all terms containing d to the left, all other terms to the right
64.75d=213.25
d=213.25/64.75
d=3+19/64.75
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