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m in (-oo:+oo)
m+11 = (1/4)*m-(2*m)-13 // - (1/4)*m-(2*m)-13
m-((1/4)*m)+2*m+11+13 = 0
m+(-1/4)*m+2*m+11+13 = 0
11/4*m+24 = 0 // - 24
11/4*m = -24 // : 11/4
m = -24/11/4
m = -96/11
m = -96/11
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