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m in (-oo:+oo)
m/15 = 10/50 // - 10/50
m/15-(10/50) = 0
m/15-1/5 = 0
1/15*m-1/5 = 0 // + 1/5
1/15*m = 1/5 // : 1/15
m = 1/5/1/15
m = 3
m = 3
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