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m in (-oo:+oo)
-229/126 = (6/7)*m+3*m+1/9 // - (6/7)*m+3*m+1/9
-((6/7)*m)-(3*m)-229/126-(1/9) = 0
(-6/7)*m-3*m-229/126-1/9 = 0
-27/7*m-27/14 = 0 // + 27/14
-27/7*m = 27/14 // : -27/7
m = 27/14/(-27/7)
m = -1/2
m = -1/2
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