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m in (-oo:+oo)
-((3/7)*m)-10 = 6*m-(635/77) // - 6*m-(635/77)
635/77-((3/7)*m)-(6*m)-10 = 0
(-3/7)*m-6*m+635/77-10 = 0
-45/7*m-135/77 = 0 // + 135/77
-45/7*m = 135/77 // : -45/7
m = 135/77/(-45/7)
m = -3/11
m = -3/11
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