first 9- 5[5]*2+6 second 9-1*2+6 third 9- 2+6 fourth 7+6 fifth 13
9-5[8-3]*2+6 = 9 - 5[5]*2 + 6 = 9 - 50 + 6 = -35 I have no idea what happened in your "second" step
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