6/21=2/c

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Solution for 6/21=2/c equation: 


D( c )

c = 0

c = 0

c = 0

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

6/21 = 2/c // - 2/c

6/21-(2/c) = 0

6/21-2*c^-1 = 0

-2*c^-1 = -2/7 // : -2

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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