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r in (-oo:+oo)
(3/4)*r-2 = (5/6)*r+5 // - (5/6)*r+5
(3/4)*r-((5/6)*r)-5-2 = 0
(3/4)*r+(-5/6)*r-5-2 = 0
-1/12*r-7 = 0 // + 7
-1/12*r = 7 // : -1/12
r = 7/(-1/12)
r = -84
r = -84
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