original

0c51 a1 = a1+(gs%-gr%)*7+gr%*2+4

0c51  94 02 47         PUSH      a1
0c54  95 02 86         PUSH%     gs%
0c57  95 02 8d         PUSH%     gr%
0c5a  02               ARITH     -
0c5b  87               PUSH      7
0c5c  03               ARITH     *
0c5d  01               ARITH     +
0c5e  95 02 8d         PUSH%     gr%
0c61  82               PUSH      2
0c62  03               ARITH     *
0c63  84               PUSH      4
0c64  01               ARITH     +
0c65  01               ARITH     +
0c66  d4 02 47         LET       a1



decompiled

0c51 a1 = a1+(gs%-gr%)*7+gr%*2+4

0c51  94 02 47         PUSH      a1
0c54  95 02 86         PUSH%     gs%
0c57  95 02 8d         PUSH%     gr%
0c5a  02               ARITH     -
0c5b  87               PUSH      7
0c5c  03               ARITH     *
0c5d  01               ARITH     +
0c5e  95 02 8d         PUSH%     gr%
0c61  82               PUSH      2
0c62  03               ARITH     *
0c63  01               ARITH     +
0c64  84               PUSH      4
0c65  01               ARITH     +
0c66  d4 02 47         LET       a1