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m in (-oo:+oo)
(1/4)*m-6 = 2*m // - 2*m
(1/4)*m-(2*m)-6 = 0
(1/4)*m-2*m-6 = 0
-7/4*m-6 = 0 // + 6
-7/4*m = 6 // : -7/4
m = 6/(-7/4)
m = -24/7
m = -24/7
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