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5d+20=-30.d=
We move all terms to the left:
5d+20-(-30.d)=0
We add all the numbers together, and all the variables
5d-(-30d)+20=0
We get rid of parentheses
5d+30d+20=0
We add all the numbers together, and all the variables
35d+20=0
We move all terms containing d to the left, all other terms to the right
35d=-20
d=-20/35
d=-4/7
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