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x in (-oo:+oo)
t*((6*n-(5*p))/11) = c // - c
t*((6*n-(5*p))/11)-c = 0
t*((6*n-5*p)/11)-c = 0
(t*(6*n-5*p))/11-c = 0
(t*(6*n-5*p))/11+(11*(-c))/11 = 0
t*(6*n-5*p)+11*(-c) = 0
6*n*t-11*c-5*p*t = 0
(6*n*t-11*c-5*p*t)/11 = 0
(6*n*t-11*c-5*p*t)/11 = 0 // * 11
6*n*t-11*c-5*p*t = 0
x belongs to the empty set
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