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m in (-oo:+oo)
(4/7)*m-(4*m)+4/5 = -4/7 // + -4/7
(4/7)*m-(4*m)+4/5-(-4/7) = 0
(4/7)*m-4*m+4/5+4/7 = 0
48/35-24/7*m = 0 // - 48/35
-24/7*m = -48/35 // : -24/7
m = -48/35/(-24/7)
m = 2/5
m = 2/5
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