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m in (-oo:+oo)
-25/9 = 5/9-m-(3*m) // - 5/9-m-(3*m)
m+3*m-25/9-(5/9) = 0
m+3*m-25/9-5/9 = 0
4*m-10/3 = 0 // + 10/3
4*m = 10/3 // : 4
m = 10/3/4
m = 5/6
m = 5/6
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