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m in (-oo:+oo)
m/15 = 10/25 // - 10/25
m/15-(10/25) = 0
m/15-2/5 = 0
1/15*m-2/5 = 0 // + 2/5
1/15*m = 2/5 // : 1/15
m = 2/5/1/15
m = 6
m = 6
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