7/9=63/c

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Solution for 7/9=63/c equation: 


D( c )

c = 0

c = 0

c = 0

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

7/9 = 63/c // - 63/c

7/9-(63/c) = 0

7/9-63*c^-1 = 0

-63*c^-1 = -7/9 // : -63

c^-1 = 1/81

-1 < 0

1/(c^1) = 1/81 // * c^1

1 = 1/81*c^1 // : 1/81

81 = c^1

c = 81

c = 81

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