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m in (-oo:+oo)
5*m-(2*m)-9 = -39 // + 39
5*m-(2*m)-9+39 = 0
5*m-2*m-9+39 = 0
3*m+30 = 0 // - 30
3*m = -30 // : 3
m = -30/3
m = -10
m = -10
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