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m in (-oo:+oo)
3/7-3*m-((4/5)*m) = -457/175 // + -457/175
3/7-3*m-((4/5)*m)-(-457/175) = 0
(-4/5)*m-3*m+3/7+457/175 = 0
76/25-19/5*m = 0 // - 76/25
-19/5*m = -76/25 // : -19/5
m = -76/25/(-19/5)
m = 4/5
m = 4/5
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