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l = x
keliling = 2(p+l)
24 = 2(x + 2 + x)
24 = 2(2x + 2)
24 = 4x + 4
24-4 = 4x
20 = 4x
20 : 4 = x
5 = x
p = x + 2 = 5 + 2 = 7 cm
l = x = 5 cm
luas = p x l
luas = 7 cm x 5 cm = 35 cm²