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m in (-oo:+oo)
(39/2)*m-13 = 73/2 // - 73/2
(39/2)*m-(73/2)-13 = 0
(39/2)*m-73/2-13 = 0
39/2*m-99/2 = 0 // + 99/2
39/2*m = 99/2 // : 39/2
m = 99/2/39/2
m = 33/13
m = 33/13
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