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m in (-oo:+oo)
(m-2)/3 = -1 // + 1
(m-2)/3+1 = 0
(m-2)/3+(1*3)/3 = 0
m+1*3-2 = 0
m+1 = 0
(m+1)/3 = 0
(m+1)/3 = 0 // * 3
m+1 = 0
m+1 = 0 // - 1
m = -1
m = -1
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