Posted by aliyah on Tuesday, June 12, 2012 at 3:33pm.
If you mean
[6 + (2x-7)/2]/3 = 31
then just start unwinding the operations:
6 + (2x-7)/2 = 93
(2x-7)/2 = 87
2x-7 = 174
2x = 181
x = 181/2
If I got the expression wrong, fix it and do similar steps.
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