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-6+19.8d=-10.2d
We move all terms to the left:
-6+19.8d-(-10.2d)=0
We get rid of parentheses
19.8d+10.2d-6=0
We add all the numbers together, and all the variables
30d-6=0
We move all terms containing d to the left, all other terms to the right
30d=6
d=6/30
d=1/5
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