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r in (-oo:+oo)
(2*r-3)/4 = 3/5 // - 3/5
(2*r-3)/4-(3/5) = 0
(2*r-3)/4-3/5 = 0
(5*(2*r-3))/(4*5)+(-3*4)/(4*5) = 0
5*(2*r-3)-3*4 = 0
10*r-27 = 0
(10*r-27)/(4*5) = 0
(10*r-27)/(4*5) = 0 // * 4*5
10*r-27 = 0
10*r-27 = 0 // + 27
10*r = 27 // : 10
r = 27/10
r = 27/10
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