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m in (-oo:+oo)
5*m-1 = 3*m+19 // - 3*m+19
5*m-(3*m)-19-1 = 0
5*m-3*m-19-1 = 0
2*m-20 = 0 // + 20
2*m = 20 // : 2
m = 20/2
m = 10
m = 10
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