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4/5d=40
We move all terms to the left:
4/5d-(40)=0
Domain of the equation: 5d!=0We multiply all the terms by the denominator
d!=0/5
d!=0
d∈R
-40*5d+4=0
Wy multiply elements
-200d+4=0
We move all terms containing d to the left, all other terms to the right
-200d=-4
d=-4/-200
d=1/50
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