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m in (-oo:+oo)
m-(6*m)+8 = -2 // + 2
m-(6*m)+2+8 = 0
m-6*m+2+8 = 0
10-5*m = 0 // - 10
-5*m = -10 // : -5
m = -10/(-5)
m = 2
m = 2
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