700/r=150/(r-110)

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Solution for 700/r=150/(r-110) equation: 


D( r )

r = 0

r-110 = 0

r = 0

r = 0

r-110 = 0

r-110 = 0

r-110 = 0 // + 110

r = 110

r in (-oo:0) U (0:110) U (110:+oo)

700/r = 150/(r-110) // - 150/(r-110)

700/r-(150/(r-110)) = 0

700/r-150*(r-110)^-1 = 0

700/r-150/(r-110) = 0

(-150*r)/(r*(r-110))+(700*(r-110))/(r*(r-110)) = 0

700*(r-110)-150*r = 0

550*r-77000 = 0

(550*r-77000)/(r*(r-110)) = 0

(550*r-77000)/(r*(r-110)) = 0 // * r*(r-110)

550*r-77000 = 0

550*r-77000 = 0 // + 77000

550*r = 77000 // : 550

r = 77000/550

r = 140

r = 140

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