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5/15x225=105
7/15x225= 75
JAWABANNYA YANG AKU GARIS BAWAHI
3x + 5x + 7x = 225
15x = 225
x = 225/15 = 15
3x = 3.15 = 45 cm
5x = 5.15 = 75 cm
7x = 7.15 = 105 cm
jadi kawat terpotong menjadi 3 bagian yaitu 45 cm, 75 cm, dan 105 cm