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x in (-oo:+oo)
(7*p+2*t)/s = n // - n
(7*p+2*t)/s-n = 0
(7*p+2*t)/s+(-n*s)/s = 0
7*p-n*s+2*t = 0
7*p-(n*s)+2*t = 0
(7*p-(n*s)+2*t)/s = 0
(7*p-(n*s)+2*t)/s = 0 // * s
7*p-(n*s)+2*t = 0
x belongs to the empty set
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