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m in (-oo:+oo)
(2/3)*m-((3/5)*m)+2/9 = 7/45 // - 7/45
(2/3)*m-((3/5)*m)+2/9-(7/45) = 0
(-3/5)*m+(2/3)*m+2/9-7/45 = 0
1/15*m+1/15 = 0 // - 1/15
1/15*m = -1/15 // : 1/15
m = -1/15/1/15
m = -1
m = -1
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