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m in (-oo:+oo)
1 = 5*m-4*m+3 // - 5*m-4*m+3
1-(-4*m)-(5*m)-3 = 0
4*m-5*m-3+1 = 0
-m-2 = 0 // + 2
-m = 2 // * -1
m = -2
m = -2
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