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

12*u^-1+4+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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