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Obw= 4x + 6y
2*(3y -x) = 6y - 2x
Obw = 6y - 2x + 2z
4x + 6y = 6y -2x +2z
6x = 2z
3x = z
P= (3y-x)*3x = 9xy - 3x² = 3x(3y-x)
teraz mi wyszło tak :) sprawdz sobie które jest lepsze