Nelson
xy = p(x + y)
xy - p(x + y) = 0
(p - x)(p - y) - p² = 0
(p - x)(p - y) = p²
Caso 1: p - x = p, p - y = p
Caso 2: p - x = p², p - y = 1
Caso 3: p - x = 1, p - y = p²
Solucion, caso 1: x = 0, y = 0
Solucion, caso 2: x = p(1 - p), y = p - 1
Solucion, caso 3: x = p - 1, y = p(1 - p)
