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m in (-oo:+oo)
(-1/2)*m+5*m+6 = 105/22 // - 105/22
(-1/2)*m+5*m-(105/22)+6 = 0
(-1/2)*m+5*m-105/22+6 = 0
9/2*m+27/22 = 0 // - 27/22
9/2*m = -27/22 // : 9/2
m = -27/22/9/2
m = -3/11
m = -3/11
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