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m in (-oo:+oo)
3*m-9 = 5*m+13 // - 5*m+13
3*m-(5*m)-13-9 = 0
3*m-5*m-13-9 = 0
-2*m-22 = 0 // + 22
-2*m = 22 // : -2
m = 22/(-2)
m = -11
m = -11
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