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m in (-oo:+oo)
7*m+3/5 = -417/5 // + -417/5
7*m+3/5-(-417/5) = 0
7*m+3/5+417/5 = 0
7*m+84 = 0 // - 84
7*m = -84 // : 7
m = -84/7
m = -12
m = -12
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