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m in (-oo:+oo)
-3 = 4*m+2*m+9 // - 4*m+2*m+9
-(4*m)-(2*m)-9-3 = 0
-4*m-2*m-9-3 = 0
-6*m-12 = 0 // + 12
-6*m = 12 // : -6
m = 12/(-6)
m = -2
m = -2
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