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m in (-oo:+oo)
(4/2)*(m-13) = 1 // - 1
(4/2)*(m-13)-1 = 0
2*(m-13)-1 = 0
2*(m-13)-1 = 0
2*m-27 = 0
2*m-27 = 0
2*m-27 = 0 // + 27
2*m = 27 // : 2
m = 27/2
m = 27/2
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