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m in (-oo:+oo)
5*(1*m-8) = -40 // + 40
5*(1*m-8)+40 = 0
5*(m-8)+40 = 0
5*(m-8)+40 = 0
5*m = 0
5*m = 0
5*m = 0 // : 5
m = 0
m = 0
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