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m in (-oo:+oo)
4/18 = m/45 // - m/45
4/18-(m/45) = 0
2/9-1/45*m = 0 // - 2/9
-1/45*m = -2/9 // : -1/45
m = -2/9/(-1/45)
m = 10
m = 10
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