2/r+6/(r+5)

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Solution for 2/r+6/(r+5) equation: 


D( r )

r = 0

r+5 = 0

r = 0

r = 0

r+5 = 0

r+5 = 0

r+5 = 0 // - 5

r = -5

r in (-oo:-5) U (-5:0) U (0:+oo)

6/(r+5)+2/r = 0

(6*r)/(r*(r+5))+(2*(r+5))/(r*(r+5)) = 0

2*(r+5)+6*r = 0

8*r+10 = 0

(8*r+10)/(r*(r+5)) = 0

(8*r+10)/(r*(r+5)) = 0 // * r*(r+5)

8*r+10 = 0

8*r+10 = 0 // - 10

8*r = -10 // : 8

r = -10/8

r = -5/4

r = -5/4

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