4=-7/u-8

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Solution for 4=-7/u-8 equation: 


D( u )

u = 0

u = 0

u = 0

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

4 = -7/u-8 // + -7/u-8

4-(-7/u)+8 = 0

7*u^-1+4+8 = 0

7*u^-1 = -12 // : 7

u^-1 = -12/7

-1 < 0

1/(u^1) = -12/7 // * u^1

1 = -12/7*u^1 // : -12/7

-7/12 = u^1

u = -7/12

u = -7/12

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