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r in (-oo:+oo)
(7/6)*r-((11/3)*r) = 5/4 // - 5/4
(7/6)*r-((11/3)*r)-(5/4) = 0
(7/6)*r+(-11/3)*r-5/4 = 0
-5/2*r-5/4 = 0 // + 5/4
-5/2*r = 5/4 // : -5/2
r = 5/4/(-5/2)
r = -1/2
r = -1/2
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