15/12=-4/f

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Solution for 15/12=-4/f equation: 


D( f )

f = 0

f = 0

f = 0

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

15/12 = -4/f // + -4/f

15/12-(-4/f) = 0

4*f^-1+15/12 = 0

4*f^-1 = -5/4 // : 4

f^-1 = -5/16

-1 < 0

1/(f^1) = -5/16 // * f^1

1 = -5/16*f^1 // : -5/16

-16/5 = f^1

f = -16/5

f = -16/5

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