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m in (-oo:+oo)
m/80 = 20/48 // - 20/48
m/80-(20/48) = 0
m/80-5/12 = 0
1/80*m-5/12 = 0 // + 5/12
1/80*m = 5/12 // : 1/80
m = 5/12/1/80
m = 100/3
m = 100/3
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