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r in (-oo:+oo)
(9/5)*r+7/5 = (6/5)*r+4/3 // - (6/5)*r+4/3
(9/5)*r-((6/5)*r)+7/5-(4/3) = 0
(9/5)*r+(-6/5)*r+7/5-4/3 = 0
3/5*r+1/15 = 0 // - 1/15
3/5*r = -1/15 // : 3/5
r = -1/15/3/5
r = -1/9
r = -1/9
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