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1 baju = 3 kaos
1 baju = x
2 baju + 3 kaos = 420.000
.
Jawab.
2 baju + 3 kaos = 420000
2 baju + 1 baju = 420000
2 (x) + (x) = 420000
2x + x = 420000
3x = 420000
x = 420000 / 3
x = 140000