3/(r+4)-1/(r-4)

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Solution for 3/(r+4)-1/(r-4) equation: 


D( r )

r+4 = 0

r-4 = 0

r+4 = 0

r+4 = 0

r+4 = 0 // - 4

r = -4

r-4 = 0

r-4 = 0

r-4 = 0 // + 4

r = 4

r in (-oo:-4) U (-4:4) U (4:+oo)

3/(r+4)-(1/(r-4)) = 0

3/(r+4)-(r-4)^-1 = 0

3/(r+4)-1/(r-4) = 0

(3*(r-4))/((r+4)*(r-4))+(-1*(r+4))/((r+4)*(r-4)) = 0

3*(r-4)-1*(r+4) = 0

2*r-16 = 0

(2*r-16)/((r+4)*(r-4)) = 0

(2*r-16)/((r+4)*(r-4)) = 0 // * (r+4)*(r-4)

2*r-16 = 0

2*r-16 = 0 // + 16

2*r = 16 // : 2

r = 16/2

r = 8

r = 8

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