4/20=x/x

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Solution for 4/20=x/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

4/20 = x/x // - x/x

4/20-(x/x) = 0

4/20-1 = 0

-4/5 = 0

x belongs to the empty set

x belongs to the empty set

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