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30 = 2 (x + x-3)
30 = 2 (2x-3)
30 = 4x-6
30+6 = 4x
36 = 4x
x = 36/4 = 9
p = x = 9
l = x-3 = 9-3 = 6
maka luasnya = p x l = 9x6 = 54