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m in (-oo:+oo)
(-2/5)*m+4/5 = 26/5 // - 26/5
(-2/5)*m+4/5-(26/5) = 0
(-2/5)*m+4/5-26/5 = 0
-2/5*m-22/5 = 0 // + 22/5
-2/5*m = 22/5 // : -2/5
m = 22/5/(-2/5)
m = -11
m = -11
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