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m in (-oo:+oo)
1/9-((5/7)*m) = 277/63 // - 277/63
1/9-((5/7)*m)-(277/63) = 0
(-5/7)*m+1/9-277/63 = 0
-5/7*m-30/7 = 0 // + 30/7
-5/7*m = 30/7 // : -5/7
m = 30/7/(-5/7)
m = -6
m = -6
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