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m in (-oo:+oo)
2/9-(7*m) = 331/72 // - 331/72
2/9-(7*m)-(331/72) = 0
2/9-7*m-331/72 = 0
-7*m-35/8 = 0 // + 35/8
-7*m = 35/8 // : -7
m = 35/8/(-7)
m = -5/8
m = -5/8
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