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m in (-oo:+oo)
(m-9)/4+3 = 0
(m-9)/4+(3*4)/4 = 0
m+3*4-9 = 0
m+3 = 0
(m+3)/4 = 0
(m+3)/4 = 0 // * 4
m+3 = 0
m+3 = 0 // - 3
m = -3
m = -3
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