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167 = (9x-10) + (5x-10) + 3x
167 = 17x -20
167+20 = 17x
187 = 17x
187/17 = x
11 = x
sisi (9x-10) = 9.11 -10 = 89 cm
sisi (5x-10) = 5.11 -10 = 45 cm
sisi 3x = 3.11 = 33 cm
jadi sisi terpanjang adalah 89 cm