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m in (-oo:+oo)
3*m-(5*m)+6 = -18 // + 18
3*m-(5*m)+6+18 = 0
3*m-5*m+6+18 = 0
24-2*m = 0 // - 24
-2*m = -24 // : -2
m = -24/(-2)
m = 12
m = 12
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