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m in (-oo:+oo)
5*m = 13/20 // - 13/20
5*m-(13/20) = 0
5*m-13/20 = 0
5*m-13/20 = 0 // + 13/20
5*m = 13/20 // : 5
m = 13/20/5
m = 13/100
m = 13/100
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