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