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m in (-oo:+oo)
m+2 = 6*m-18 // - 6*m-18
m-(6*m)+2+18 = 0
m-6*m+2+18 = 0
20-5*m = 0 // - 20
-5*m = -20 // : -5
m = -20/(-5)
m = 4
m = 4
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