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r in (-oo:+oo)
(3*r)/6-5 = r/7-r+(1/7)*r-35 // - r/7-r+(1/7)*r-35
(3*r)/6-(r/7)+r-((1/7)*r)-5+35 = 0
(3*r)/6-(r/7)+r+(-1/7)*r-5+35 = 0
17/14*r+30 = 0 // - 30
17/14*r = -30 // : 17/14
r = -30/17/14
r = -420/17
r = -420/17
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