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m in (-oo:+oo)
7/9 = m/15 // - m/15
7/9-(m/15) = 0
7/9-1/15*m = 0 // - 7/9
-1/15*m = -7/9 // : -1/15
m = -7/9/(-1/15)
m = 35/3
m = 35/3
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