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m in (-oo:+oo)
(-2/5)*m-4 = 6 // - 6
(-2/5)*m-6-4 = 0
-2/5*m-10 = 0 // + 10
-2/5*m = 10 // : -2/5
m = 10/(-2/5)
m = -25
m = -25
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