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40d+1.25=100
We move all terms to the left:
40d+1.25-(100)=0
We add all the numbers together, and all the variables
40d-98.75=0
We move all terms containing d to the left, all other terms to the right
40d=98.75
d=98.75/40
d=2+6.8181818181818/14.545454545455
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