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m in (-oo:+oo)
-167/30 = 2*m+4*m-(1/6) // - 2*m+4*m-(1/6)
1/6-(2*m)-(4*m)-167/30 = 0
1/6-2*m-4*m-167/30 = 0
-6*m-27/5 = 0 // + 27/5
-6*m = 27/5 // : -6
m = 27/5/(-6)
m = -9/10
m = -9/10
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