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r in (-oo:+oo)
(3*(2*r-5))/5 = 3*r-(6/4) // - 3*r-(6/4)
(3*(2*r-5))/5-(3*r)+6/4 = 0
(3*(2*r-5))/5-3*r+6/4 = 0
(3*(2*r-5))/5-3*r+3/2 = 0
(2*3*(2*r-5))/(2*5)+(-3*2*5*r)/(2*5)+(3*5)/(2*5) = 0
2*3*(2*r-5)-3*2*5*r+3*5 = 0
15-18*r-30 = 0
-18*r-15 = 0
(-18*r-15)/(2*5) = 0
(-18*r-15)/(2*5) = 0 // * 2*5
-18*r-15 = 0
-18*r-15 = 0 // + 15
-18*r = 15 // : -18
r = 15/(-18)
r = -5/6
r = -5/6
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