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P(x - 3 / 3 ; y + 4 / 4) = x + y
P(3 ; 1) = ?
(x - 3) / 3 = 3
(x - 3) = 9
x = 9 + 3
x = 12
(y + 4) / 4 = 1
(y + 4) = 4
y = 4 - 4
y = 0
P(3 ; 1) = 12 + 0
P(3 ; 1) = 12