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m in (-oo:+oo)
13 = 3*m-2*m+9 // - 3*m-2*m+9
13-(-2*m)-(3*m)-9 = 0
2*m-3*m-9+13 = 0
4-m = 0 // - 4
-m = -4 // * -1
m = 4
m = 4
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