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r in (-oo:+oo)
(3*(2*r-5))/5 = 3*r-(6/3) // - 3*r-(6/3)
(3*(2*r-5))/5-(3*r)+6/3 = 0
(3*(2*r-5))/5-3*r+6/3 = 0
(3*(2*r-5))/5-3*r+2 = 0
(3*(2*r-5))/5+(-3*5*r)/5+(2*5)/5 = 0
3*(2*r-5)-3*5*r+2*5 = 0
10-9*r-15 = 0
-9*r-5 = 0
(-9*r-5)/5 = 0
(-9*r-5)/5 = 0 // * 5
-9*r-5 = 0
-9*r-5 = 0 // + 5
-9*r = 5 // : -9
r = 5/(-9)
r = -5/9
r = -5/9
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