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m in (-oo:+oo)
(1/5)*m+2/3-2 = m-(2/5) // - m-(2/5)
(1/5)*m-m+2/3+2/5-2 = 0
-4/5*m-14/15 = 0 // + 14/15
-4/5*m = 14/15 // : -4/5
m = 14/15/(-4/5)
m = -7/6
m = -7/6
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