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m in (-oo:+oo)
m/30 = 12/72 // - 12/72
m/30-(12/72) = 0
m/30-1/6 = 0
1/30*m-1/6 = 0 // + 1/6
1/30*m = 1/6 // : 1/30
m = 1/6/1/30
m = 5
m = 5
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