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