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m in (-oo:+oo)
m/12 = 225/15 // - 225/15
m/12-(225/15) = 0
m/12-15 = 0
1/12*m-15 = 0 // + 15
1/12*m = 15 // : 1/12
m = 15/1/12
m = 180
m = 180
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