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r in (-oo:+oo)
(3/4)*r-(3/2) = 5/6 // - 5/6
(3/4)*r-(3/2)-(5/6) = 0
(3/4)*r-3/2-5/6 = 0
3/4*r-7/3 = 0 // + 7/3
3/4*r = 7/3 // : 3/4
r = 7/3/3/4
r = 28/9
r = 28/9
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