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A + D = 146
Jadi, A = 79 ,D =67
berat ani = x + 12
berat ani + berat dona = 146 kg
x + ( x+ 12) = 146
2x + 12 = 146
2x = 134
x = 67 Kg
jadi berat dona = 67 kg
sedangkan berat ani = 67 + 12 = 79 Kg