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