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maaf klo salah hehe
d1 = 24
d2 = (2x + 4)
L = 1/2.d1.d2
168 = 1/2.24.(2x+4)
168 × 2 : 24 = 2x+4
14 = 2x+4
14 - 4 = 2x
10 : 2 = x
x = 5