(9/(c-9))-(9/4)=(c/(c-9))

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Solution for (9/(c-9))-(9/4)=(c/(c-9)) equation: 


D( c )

c-9 = 0

c-9 = 0

c-9 = 0

c-9 = 0 // + 9

c = 9

c in (-oo:9) U (9:+oo)

9/(c-9)-(9/4) = c/(c-9) // - c/(c-9)

9/(c-9)-(c/(c-9))-(9/4) = 0

9/(c-9)-(c/(c-9))-9/4 = 0

9/(c-9)+(-1*c)/(c-9)-9/4 = 0

(4*9)/(4*(c-9))+(-1*4*c)/(4*(c-9))+(-9*(c-9))/(4*(c-9)) = 0

4*9-9*(c-9)-1*4*c = 0

36-4*c-9*c+81 = 0

117-13*c = 0

(117-13*c)/(4*(c-9)) = 0

(117-13*c)/(4*(c-9)) = 0 // * 4*(c-9)

117-13*c = 0

117-13*c = 0 // - 117

-13*c = -117 // : -13

c = -117/(-13)

c = 9

c in { 9} 

c belongs to the empty set

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