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m in (-oo:+oo)
(3/5)*m+1/4 = m-(1/5) // - m-(1/5)
(3/5)*m-m+1/4+1/5 = 0
9/20-2/5*m = 0 // - 9/20
-2/5*m = -9/20 // : -2/5
m = -9/20/(-2/5)
m = 9/8
m = 9/8
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