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m in (-oo:+oo)
3*m+4/7 = (-3/5)*m+272/35 // - (-3/5)*m+272/35
3*m-((-3/5)*m)+4/7-(272/35) = 0
3*m+(3/5)*m+4/7-272/35 = 0
18/5*m-36/5 = 0 // + 36/5
18/5*m = 36/5 // : 18/5
m = 36/5/18/5
m = 2
m = 2
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