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5x - 6 = 2x + 12
5x - 2x -6 + 6 = 2x - 2x + 12 + 6
3x = 18
x = 6
maka
MN = KL = LM = KN
2x + 12 = 2(6) + 12 = 12 + 12 = 24 cm