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10d=4d-9
We move all terms to the left:
10d-(4d-9)=0
We get rid of parentheses
10d-4d+9=0
We add all the numbers together, and all the variables
6d+9=0
We move all terms containing d to the left, all other terms to the right
6d=-9
d=-9/6
d=-1+1/2
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