18/r=78/(r+10)

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Solution for 18/r=78/(r+10) equation: 


D( r )

r = 0

r+10 = 0

r = 0

r = 0

r+10 = 0

r+10 = 0

r+10 = 0 // - 10

r = -10

r in (-oo:-10) U (-10:0) U (0:+oo)

18/r = 78/(r+10) // - 78/(r+10)

18/r-(78/(r+10)) = 0

18/r-78*(r+10)^-1 = 0

18/r-78/(r+10) = 0

(-78*r)/(r*(r+10))+(18*(r+10))/(r*(r+10)) = 0

18*(r+10)-78*r = 0

180-60*r = 0

(180-60*r)/(r*(r+10)) = 0

(180-60*r)/(r*(r+10)) = 0 // * r*(r+10)

180-60*r = 0

180-60*r = 0 // - 180

-60*r = -180 // : -60

r = -180/(-60)

r = 3

r = 3

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