4=12/u-9

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Solution for 4=12/u-9 equation: 


D( u )

u = 0

u = 0

u = 0

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

4 = 12/u-9 // - 12/u-9

4-(12/u)+9 = 0

4-12*u^-1+9 = 0

-12*u^-1 = -13 // : -12

u^-1 = 13/12

-1 < 0

1/(u^1) = 13/12 // * u^1

1 = 13/12*u^1 // : 13/12

12/13 = u^1

u = 12/13

u = 12/13

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