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