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2A+B = 52
-----------------(+)
3A = 54
A = 18
18-B = 2
B = 16
a = 2 + b
Subtitusikan kepersamaan
2a + b = 52
2 (2+b) + b= 52
4 + 2b + b = 52
3b = 52-4
3b = 48
b = 48/3
b = 16
a = 2 + b
= 2+ 16
= 18
Jadi, usia A = 18 thn, dan usia B = 16 thn