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p in (-oo:+oo)
(3*p+1)/7+(2*p-4)/7 = 1 // - 1
(3*p+1)/7+(2*p-4)/7-1 = 0
(3*p+1)/7+(2*p-4)/7+(-1*7)/7 = 0
3*p+2*p-1*7-4+1 = 0
5*p-7-3 = 0
5*p-10 = 0
(5*p-10)/7 = 0
(5*p-10)/7 = 0 // * 7
5*p-10 = 0
5*p-10 = 0 // + 10
5*p = 10 // : 5
p = 10/5
p = 2
p = 2
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