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