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P = 3x-3
l = x+1
p×l = 72
(3x - 3) × (x+1) =72
3x² - 3 = 72
3x² = 75
x² = 75:3= 25
x = √25
x = 5
jadi lebar nya = x + 1 = 5 + 1 = 6