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m in (-oo:+oo)
m/12 = 900/30 // - 900/30
m/12-(900/30) = 0
m/12-30 = 0
1/12*m-30 = 0 // + 30
1/12*m = 30 // : 1/12
m = 30/1/12
m = 360
m = 360
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