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m in (-oo:+oo)
3*(-2*m-2) = -30 // + 30
3*(-2*m-2)+30 = 0
3*(-2*m-2)+30 = 0
24-6*m = 0
24-6*m = 0
24-6*m = 0 // - 24
-6*m = -24 // : -6
m = -24/(-6)
m = 4
m = 4
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