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m in (-oo:+oo)
9/8 = m/5 // - m/5
9/8-(m/5) = 0
9/8-1/5*m = 0 // - 9/8
-1/5*m = -9/8 // : -1/5
m = -9/8/(-1/5)
m = 45/8
m = 45/8
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