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126= 5x+6x+7x
126 = 18x
x = 126/18
x=7
panjang sisi = 5x=> 5×7 => 35
6x => 6×7 => 42
7x => 7×7 => 49 cm
jadi sisi terpanjang adalah 49 cm
sisi b = 6/18 * 126 = 42 cm
sisi c = 7/18 * 126 = 49 cm