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r in (-oo:+oo)
(4*(2*r-5))/5 = 4*r-(3/6) // - 4*r-(3/6)
(4*(2*r-5))/5-(4*r)+3/6 = 0
(4*(2*r-5))/5-4*r+3/6 = 0
(4*(2*r-5))/5-4*r+1/2 = 0
(2*4*(2*r-5))/(2*5)+(-4*2*5*r)/(2*5)+(1*5)/(2*5) = 0
2*4*(2*r-5)-4*2*5*r+1*5 = 0
5-24*r-40 = 0
-24*r-35 = 0
(-24*r-35)/(2*5) = 0
(-24*r-35)/(2*5) = 0 // * 2*5
-24*r-35 = 0
-24*r-35 = 0 // + 35
-24*r = 35 // : -24
r = 35/(-24)
r = -35/24
r = -35/24
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