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m in (-oo:+oo)
-66/35 = 5*m+(3/5)*m-(2/7) // - 5*m+(3/5)*m-(2/7)
2/7-(5*m)-((3/5)*m)-66/35 = 0
(-3/5)*m-5*m-66/35+2/7 = 0
-28/5*m-8/5 = 0 // + 8/5
-28/5*m = 8/5 // : -28/5
m = 8/5/(-28/5)
m = -2/7
m = -2/7
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