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r in (-oo:+oo)
(3*(2*r-6))/5 = 3*r-(10/2) // - 3*r-(10/2)
(3*(2*r-6))/5-(3*r)+10/2 = 0
(3*(2*r-6))/5-3*r+10/2 = 0
(3*(2*r-6))/5-3*r+5 = 0
(3*(2*r-6))/5+(-3*5*r)/5+(5^2)/5 = 0
3*(2*r-6)-3*5*r+25 = 0
25-9*r-18 = 0
7-9*r = 0
(7-9*r)/5 = 0
(7-9*r)/5 = 0 // * 5
7-9*r = 0
7-9*r = 0 // - 7
-9*r = -7 // : -9
r = -7/(-9)
r = 7/9
r = 7/9
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