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