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m in (-oo:+oo)
4*m-8 = -28/3 // + -28/3
4*m-(-28/3)-8 = 0
4*m+28/3-8 = 0
4*m+4/3 = 0 // - 4/3
4*m = -4/3 // : 4
m = -4/3/4
m = -1/3
m = -1/3
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