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m in (-oo:+oo)
m/12 = 6/18 // - 6/18
m/12-(6/18) = 0
m/12-1/3 = 0
1/12*m-1/3 = 0 // + 1/3
1/12*m = 1/3 // : 1/12
m = 1/3/1/12
m = 4
m = 4
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