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4 = b
# = (2a) + (b²)
# = (2x-12) + (4²)
# = -24 + 16
# = -8
4.
1
--x18=4²/4~ 4½kg
4
15kg - 4½kg
10½kg
banyak kemasan gula ½kg adalah
21. 2
----x------= 21 bungkus
2. 1