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r in (-oo:+oo)
(5*r+60)/20 = (3*r-9)/3 // - (3*r-9)/3
(5*r+60)/20-((3*r-9)/3) = 0
(5*r+60)/20+(-1*(3*r-9))/3 = 0
(3*(5*r+60))/(3*20)+(-1*20*(3*r-9))/(3*20) = 0
3*(5*r+60)-1*20*(3*r-9) = 0
360-45*r = 0
(360-45*r)/(3*20) = 0
(360-45*r)/(3*20) = 0 // * 3*20
360-45*r = 0
360-45*r = 0 // - 360
-45*r = -360 // : -45
r = -360/(-45)
r = 8
r = 8
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