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y - krótszy bok
L - obwód
y = x - 6
y = L/5
y = (2x + 2y)/5
y = (2x + 2x - 12)/5
y = (4x - 12)/5
y = [4 * (x - 3)]/5
P = x * y
P = x * [4 * (x - 3)]/5 = [4x * (x - 3)]/5