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m in (-oo:+oo)
(1/4)*m = (1/12)*m-3 // - (1/12)*m-3
(1/4)*m-((1/12)*m)+3 = 0
(1/4)*m+(-1/12)*m+3 = 0
1/6*m+3 = 0 // - 3
1/6*m = -3 // : 1/6
m = -3/1/6
m = -18
m = -18
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