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r in (-oo:+oo)
(8*(2*r-2))/5 = 8*r-(7/3) // - 8*r-(7/3)
(8*(2*r-2))/5-(8*r)+7/3 = 0
(8*(2*r-2))/5-8*r+7/3 = 0
(3*8*(2*r-2))/(3*5)+(-8*3*5*r)/(3*5)+(5*7)/(3*5) = 0
3*8*(2*r-2)-8*3*5*r+5*7 = 0
35-72*r-48 = 0
-72*r-13 = 0
(-72*r-13)/(3*5) = 0
(-72*r-13)/(3*5) = 0 // * 3*5
-72*r-13 = 0
-72*r-13 = 0 // + 13
-72*r = 13 // : -72
r = 13/(-72)
r = -13/72
r = -13/72
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