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m in (-oo:+oo)
4*m+9 = 5*m+1 // - 5*m+1
4*m-(5*m)-1+9 = 0
4*m-5*m-1+9 = 0
8-m = 0 // - 8
-m = -8 // * -1
m = 8
m = 8
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