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b = bilangan terbesar
a + b = 40
b = 40 - a
b disubstitusikan ke 3a = b - 20 menjadi 3a = 40 - a - 20
3a = 40 - a - 20
3a + a = 40 - 20
4a = 20
a = 5
b = 40 - 5
b = 35