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m in (-oo:+oo)
7/5 = m/3 // - m/3
7/5-(m/3) = 0
7/5-1/3*m = 0 // - 7/5
-1/3*m = -7/5 // : -1/3
m = -7/5/(-1/3)
m = 21/5
m = 21/5
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