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m in (-oo:+oo)
1/6 = m/4 // - m/4
1/6-(m/4) = 0
1/6-1/4*m = 0 // - 1/6
-1/4*m = -1/6 // : -1/4
m = -1/6/(-1/4)
m = 2/3
m = 2/3
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