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m in (-oo:+oo)
5/9-3*m = -29/45 // + -29/45
5/9-3*m-(-29/45) = 0
5/9-3*m+29/45 = 0
6/5-3*m = 0 // - 6/5
-3*m = -6/5 // : -3
m = -6/5/(-3)
m = 2/5
m = 2/5
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