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KL = LM = (2x + 5) cm
K = 40 cm
KL + LM + KM = 40 cm
(2x + 5) cm + (2x + 5) cm + x cm = 40 cm
5x cm + 10 cm = 40 cm
5x cm = 40 cm - 10 cm
5x cm = 30 cm
5x = 30
x =
x = 6
Jadi, nilai x adalah 6
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