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m in (-oo:+oo)
m/20 = 85/52 // - 85/52
m/20-(85/52) = 0
m/20-85/52 = 0
1/20*m-85/52 = 0 // + 85/52
1/20*m = 85/52 // : 1/20
m = 85/52/1/20
m = 425/13
m = 425/13
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