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