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m in (-oo:+oo)
(-1/2)*m+6*m+3 = -2 // + 2
(-1/2)*m+6*m+2+3 = 0
11/2*m+5 = 0 // - 5
11/2*m = -5 // : 11/2
m = -5/11/2
m = -10/11
m = -10/11
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