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x in (-oo:+oo)
h = (t-n-(5*z))/5 // - (t-n-(5*z))/5
h-((t-n-(5*z))/5) = 0
h-((t-n-5*z)/5) = 0
(-1*(t-n-5*z))/5+h = 0
(-1*(t-n-5*z))/5+(5*h)/5 = 0
5*h-1*(t-n-5*z) = 0
5*h+n-t+5*z = 0
(5*h+n-t+5*z)/5 = 0
(5*h+n-t+5*z)/5 = 0 // * 5
5*h+n-t+5*z = 0
x belongs to the empty set
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