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p + l = Keliling/2
2x - 6 + x + 8 = 28/2
3x + 2 = 14
3x = 14 - 2
x = 12/3
x = 4
Luas = ( 2x - 6)(x + 8)
= (2(4) - 6)(4 + 8)
= (8-6)12
= 2(12)
= 24 cm²