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m in (-oo:+oo)
4*(5-(5*m)) = -60 // + 60
4*(5-(5*m))+60 = 0
4*(5-5*m)+60 = 0
4*(5-5*m)+60 = 0
80-20*m = 0
80-20*m = 0
80-20*m = 0 // - 80
-20*m = -80 // : -20
m = -80/(-20)
m = 4
m = 4
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