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2b + 4s = 52 |×1| 2b + 4s = 52 -
-2s = -12
s = -12/-2
s = 6
b + s = 20
b + 6 = 20
b = 20 - 6
b = 14
2) kembalian = (2 × 100.000) - (125.000 + 25.250 - 10.000)
= 200.000 - 140.250
= 59.750
3) banyak pohon = 12 × 35 : 3
= 140 pohon