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72F8: Adjust tank position for left orientation
Subtracts $20 from X position to compensate for right-bias offset. Called for left-facing tanks on bank.
Input
C X position + $10 offset
Output
C Corrected X position
invert_tank_offset_delta 72F8 LD A,C C = C - $20.
72F9 SUB $20
72FB LD C,A
72FC RET
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