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m in (-oo:+oo)
3/8 = 4*m-(6/12) // - 4*m-(6/12)
3/8-(4*m)+6/12 = 0
3/8-4*m+6/12 = 0
7/8-4*m = 0 // - 7/8
-4*m = -7/8 // : -4
m = -7/8/(-4)
m = 7/32
m = 7/32
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