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21/56=3/d=
We move all terms to the left:
21/56-(3/d)=0
Domain of the equation: d)!=0We add all the numbers together, and all the variables
d!=0/1
d!=0
d∈R
-(+3/d)+21/56=0
We get rid of parentheses
-3/d+21/56=0
We calculate fractions
There is no solution for this equation
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