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m in (-oo:+oo)
5*(4-(4*m)) = -180 // + 180
5*(4-(4*m))+180 = 0
5*(4-4*m)+180 = 0
5*(4-4*m)+180 = 0
200-20*m = 0
200-20*m = 0
200-20*m = 0 // - 200
-20*m = -200 // : -20
m = -200/(-20)
m = 10
m = 10
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