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2.1/3d=28
We move all terms to the left:
2.1/3d-(28)=0
Domain of the equation: 3d!=0We multiply all the terms by the denominator
d!=0/3
d!=0
d∈R
-28*3d+2.1=0
Wy multiply elements
-84d+2.1=0
We move all terms containing d to the left, all other terms to the right
-84d=-2.1
d=-2.1/-84
d=1/40
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