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m in (-oo:+oo)
(1/2)*m+(3/4)*m+1/4 = 12 // - 12
(1/2)*m+(3/4)*m+1/4-12 = 0
5/4*m-47/4 = 0 // + 47/4
5/4*m = 47/4 // : 5/4
m = 47/4/5/4
m = 47/5
m = 47/5
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