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Jumlah total biloks hrs = 0
+1 +1 +Cr -2 -2 -2 -2 = 0
Cr = 6
2 . bo . k + bo. Cr + 4 . bo. O = 0
2 + bo . Cr + 4 (-2) = 0
2 + bo . Cr + (-8) = 0
2 + bo Cr = 8
bo Cr = 8 - 2 = +6
caranya :)