7/10=21/c

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Solution for 7/10=21/c equation: 


D( c )

c = 0

c = 0

c = 0

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

7/10 = 21/c // - 21/c

7/10-(21/c) = 0

7/10-21*c^-1 = 0

-21*c^-1 = -7/10 // : -21

c^-1 = 1/30

-1 < 0

1/(c^1) = 1/30 // * c^1

1 = 1/30*c^1 // : 1/30

30 = c^1

c = 30

c = 30

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