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r in (-oo:+oo)
(1/6)*r+(1/5)*r = 11 // - 11
(1/6)*r+(1/5)*r-11 = 0
11/30*r-11 = 0 // + 11
11/30*r = 11 // : 11/30
r = 11/11/30
r = 30
r = 30
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