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m in (-oo:+oo)
(m-2)/4 = -2 // + 2
(m-2)/4+2 = 0
(m-2)/4+(2*4)/4 = 0
m+2*4-2 = 0
m+6 = 0
(m+6)/4 = 0
(m+6)/4 = 0 // * 4
m+6 = 0
m+6 = 0 // - 6
m = -6
m = -6
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