-0.1279=4/r

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Solution for -0.1279=4/r equation: 


D( r )

r = 0

r = 0

r = 0

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

-0.1279 = 4/r // - 4/r

-(4/r)-0.1279 = 0

-4*r^-1-0.1279 = 0

-4*r^-1 = 0.1279 // : -4

r^-1 = -0.031975

-1 < 0

1/(r^1) = -0.031975 // * r^1

1 = -0.031975*r^1 // : -0.031975

-31.27443315 = r^1

r = -31.27443315

r = -31.27443315

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