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m in (-oo:+oo)
(2/3)*m-(1/3) = 4 // - 4
(2/3)*m-(1/3)-4 = 0
(2/3)*m-1/3-4 = 0
2/3*m-13/3 = 0 // + 13/3
2/3*m = 13/3 // : 2/3
m = 13/3/2/3
m = 13/2
m = 13/2
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