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m in (-oo:+oo)
m-((6/2)*m) = 5/4 // - 5/4
m-((6/2)*m)-(5/4) = 0
m-3*m-5/4 = 0
-2*m-5/4 = 0 // + 5/4
-2*m = 5/4 // : -2
m = 5/4/(-2)
m = -5/8
m = -5/8
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