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r in (-oo:+oo)
(5*r+10)/15 = (2*r-16)/2 // - (2*r-16)/2
(5*r+10)/15-((2*r-16)/2) = 0
(5*r+10)/15+(-1*(2*r-16))/2 = 0
(2*(5*r+10))/(2*15)+(-1*15*(2*r-16))/(2*15) = 0
2*(5*r+10)-1*15*(2*r-16) = 0
260-20*r = 0
(260-20*r)/(2*15) = 0
(260-20*r)/(2*15) = 0 // * 2*15
260-20*r = 0
260-20*r = 0 // - 260
-20*r = -260 // : -20
r = -260/(-20)
r = 13
r = 13
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