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b - a = 15.000
2a - a = 15.000a = 15.000
b = 2a
b = 2 × 15000
b = 30.000
c = 3a c = 3 × 15000
c = 45.000
Jumlah uang
a+b+c = 15.000 + 30.000 + 45.000
=Rp 90.000
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