2/r+5/(r+6)

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


D( r )

r = 0

r+6 = 0

r = 0

r = 0

r+6 = 0

r+6 = 0

r+6 = 0 // - 6

r = -6

r in (-oo:-6) U (-6:0) U (0:+oo)

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

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

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

7*r+12 = 0

(7*r+12)/(r*(r+6)) = 0

(7*r+12)/(r*(r+6)) = 0 // * r*(r+6)

7*r+12 = 0

7*r+12 = 0 // - 12

7*r = -12 // : 7

r = -12/7

r = -12/7

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