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maka utuh = 1 = 7/7
maka
2/7 : 18 = 7/2 x 18 = 7x9 = 63 kg
5/9 berat ardi
5/9 x 63
5 x 7
35
maka 35 kg
2/7 A = 18 kg.
maka
1/7 A = 9 kg
9/63 A = 9 kg
1/63 = 1 kg
jadi
5/9 A = x
35/63 A = 35kg