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192 = 2(9x) + 2(7x)
192 = 18x + 14x
192 = 32x
x = 6
Panjang = 9x = 9 × 6 = 54 cm
Lebar = 7x = 7 × 6 = 42 cm
Luas = p × l
Luas = 54 × 42 = 2268 cm²
(ini menurut saya)