4/15=20/c

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Solution for 4/15=20/c equation: 


D( c )

c = 0

c = 0

c = 0

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

4/15 = 20/c // - 20/c

4/15-(20/c) = 0

4/15-20*c^-1 = 0

-20*c^-1 = -4/15 // : -20

c^-1 = 1/75

-1 < 0

1/(c^1) = 1/75 // * c^1

1 = 1/75*c^1 // : 1/75

75 = c^1

c = 75

c = 75

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