21/c=3

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Solution for 21/c=3 equation: 


D( c )

c = 0

c = 0

c = 0

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

21/c = 3 // - 3

21/c-3 = 0

21*c^-1 = 3 // : 21

c^-1 = 1/7

-1 < 0

1/(c^1) = 1/7 // * c^1

1 = 1/7*c^1 // : 1/7

7 = c^1

c = 7

c = 7

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