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r in (-oo:+oo)
(8/3)*r-((9/4)*r) = -5/12 // + -5/12
(8/3)*r-((9/4)*r)-(-5/12) = 0
(8/3)*r+(-9/4)*r+5/12 = 0
5/12*r+5/12 = 0 // - 5/12
5/12*r = -5/12 // : 5/12
r = -5/12/5/12
r = -1
r = -1
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