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2 ( 5a + 3a) = 96
2 ( 8a ) = 96
16a = 96
a = 96/16
a = 6
panjang = 5 x 6
= 30
lebar = 3 x 8
= 18
luas = p x l
= 30 x 18
= 540cm²
jawabannya 540cm²