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m in (-oo:+oo)
(2*m-3)/4 = -4 // + 4
(2*m-3)/4+4 = 0
(2*m-3)/4+(4^2)/4 = 0
2*m-3+16 = 0
2*m+13 = 0
(2*m+13)/4 = 0
(2*m+13)/4 = 0 // * 4
2*m+13 = 0
2*m+13 = 0 // - 13
2*m = -13 // : 2
m = -13/2
m = -13/2
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