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3/10d=9
We move all terms to the left:
3/10d-(9)=0
Domain of the equation: 10d!=0We multiply all the terms by the denominator
d!=0/10
d!=0
d∈R
-9*10d+3=0
Wy multiply elements
-90d+3=0
We move all terms containing d to the left, all other terms to the right
-90d=-3
d=-3/-90
d=1/30
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