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P + L = 30
P = L + 6
P - L = 6
P + L = 30
P - L = 6
---------------- -
2L = 24
L = 12
P + L = 30
P + 12 = 30
P = 30 - 12
P = 18
Luas = P x L = 18 x 12 = 216