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m in (-oo:+oo)
2 = 2*m-m+6 // - 2*m-m+6
m-(2*m)-6+2 = 0
m-2*m-6+2 = 0
-m-4 = 0 // + 4
-m = 4 // * -1
m = -4
m = -4
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