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m in (-oo:+oo)
7*m+1 = 5*m+9 // - 5*m+9
7*m-(5*m)-9+1 = 0
7*m-5*m-9+1 = 0
2*m-8 = 0 // + 8
2*m = 8 // : 2
m = 8/2
m = 4
m = 4
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