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-19.4-15d+27d=4.4
We move all terms to the left:
-19.4-15d+27d-(4.4)=0
We add all the numbers together, and all the variables
12d-23.8=0
We move all terms containing d to the left, all other terms to the right
12d=23.8
d=23.8/12
d=1+6.55555555556/6.66666666667
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