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m in (-oo:+oo)
m+11 = 1/4-(2*m) // - 1/4-(2*m)
m+2*m-(1/4)+11 = 0
m+2*m-1/4+11 = 0
3*m+43/4 = 0 // - 43/4
3*m = -43/4 // : 3
m = -43/4/3
m = -43/12
m = -43/12
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