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m in (-oo:+oo)
(-2/7)*m+1/2 = 6*m-(57/14) // - 6*m-(57/14)
(-2/7)*m-(6*m)+1/2+57/14 = 0
(-2/7)*m-6*m+1/2+57/14 = 0
32/7-44/7*m = 0 // - 32/7
-44/7*m = -32/7 // : -44/7
m = -32/7/(-44/7)
m = 8/11
m = 8/11
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