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m in (-oo:+oo)
-6 = 3*m+m+10 // - 3*m+m+10
-(3*m)-m-10-6 = 0
-3*m-m-10-6 = 0
-4*m-16 = 0 // + 16
-4*m = 16 // : -4
m = 16/(-4)
m = -4
m = -4
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