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