4/7=28/c

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Solution for 4/7=28/c equation: 


D( c )

c = 0

c = 0

c = 0

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

4/7 = 28/c // - 28/c

4/7-(28/c) = 0

4/7-28*c^-1 = 0

-28*c^-1 = -4/7 // : -28

c^-1 = 1/49

-1 < 0

1/(c^1) = 1/49 // * c^1

1 = 1/49*c^1 // : 1/49

49 = c^1

c = 49

c = 49

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