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m in (-oo:+oo)
m/15 = 16/20 // - 16/20
m/15-(16/20) = 0
m/15-4/5 = 0
1/15*m-4/5 = 0 // + 4/5
1/15*m = 4/5 // : 1/15
m = 4/5/1/15
m = 12
m = 12
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