36/42=18/c

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Solution for 36/42=18/c equation: 


D( c )

c = 0

c = 0

c = 0

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

36/42 = 18/c // - 18/c

36/42-(18/c) = 0

36/42-18*c^-1 = 0

-18*c^-1 = -6/7 // : -18

c^-1 = 1/21

-1 < 0

1/(c^1) = 1/21 // * c^1

1 = 1/21*c^1 // : 1/21

21 = c^1

c = 21

c = 21

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