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m in (-oo:+oo)
1/4-(5/3) = m/12 // - m/12
1/4-(m/12)-(5/3) = 0
1/4-(m/12)-5/3 = 0
-1/12*m-17/12 = 0 // + 17/12
-1/12*m = 17/12 // : -1/12
m = 17/12/(-1/12)
m = -17
m = -17
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