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r in (-oo:+oo)
(2*r)/5-(r/5)-26 = -29 // + 29
(2*r)/5-(r/5)-26+29 = 0
1/5*r+3 = 0 // - 3
1/5*r = -3 // : 1/5
r = -3/1/5
r = -15
r = -15
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