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M in (-oo:+oo)
(M+2)/3 = 5 // - 5
(M+2)/3-5 = 0
(M+2)/3+(-5*3)/3 = 0
M-5*3+2 = 0
M-13 = 0
(M-13)/3 = 0
(M-13)/3 = 0 // * 3
M-13 = 0
M-13 = 0 // + 13
M = 13
M = 13
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