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m in (-oo:+oo)
5/6 = 3/4-m/12 // - 3/4-m/12
5/6-(-m/12)-(3/4) = 0
(1/12)*m+5/6-3/4 = 0
1/12*m+1/12 = 0 // - 1/12
1/12*m = -1/12 // : 1/12
m = -1/12/1/12
m = -1
m = -1
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