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n1 + n2
7,5 n1 + 7,5 n2 = 7,2 n1 + 8,1 n2
0,3 n1 = 0,6 n2
0,3 = n1
0,6 = n2
perbandingan:
0,6 n1 = 0,3 n2
0,2 n1 = 0,1 n2
atau
2 : 1