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-5380-50d=-140d-619
We move all terms to the left:
-5380-50d-(-140d-619)=0
We get rid of parentheses
-50d+140d+619-5380=0
We add all the numbers together, and all the variables
90d-4761=0
We move all terms containing d to the left, all other terms to the right
90d=4761
d=4761/90
d=52+9/10
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