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P₁ = 36 cm
a = (x - 2) cm
P₁ = P₀ - a
36 = (3x + 4) - (x - 2)
36 = 3x + 4 - x + 2
36 = 2x + 6
2x = 36 - 6
2x = 30
x = 15 cm
P₀ = 3x + 4
= 3(15) + 4
= 45 + 4
= 49 cm
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