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m in (-oo:+oo)
1/3-4*m = 23/6 // - 23/6
1/3-4*m-(23/6) = 0
1/3-4*m-23/6 = 0
-4*m-7/2 = 0 // + 7/2
-4*m = 7/2 // : -4
m = 7/2/(-4)
m = -7/8
m = -7/8
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