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m in (-oo:+oo)
(1/4)*m+(1/3)*m-(1/4)+1/6 = 0
(1/4)*m+(1/3)*m-1/4+1/6 = 0
7/12*m-1/12 = 0 // + 1/12
7/12*m = 1/12 // : 7/12
m = 1/12/7/12
m = 1/7
m = 1/7
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