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m in (-oo:+oo)
m/2 = 6/18 // - 6/18
m/2-(6/18) = 0
m/2-1/3 = 0
1/2*m-1/3 = 0 // + 1/3
1/2*m = 1/3 // : 1/2
m = 1/3/1/2
m = 2/3
m = 2/3
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