You don't give enough information. Here's a couple of things to try:
1 - your grammar already has the precedence rules encoded in its
structure. It's obvious, for example, that unary expressions have higher
precedence than summation expressions. You only use the explicit '%prec'
precedence when there *isn't* an obvious precedence in your grammar;
you shouldn't have both. Take out the %prec/%lefts, see what happens.
The portion of grammar that you give looks Ok without these extras, but
something else might give a conflict.
2 - Take out the "| PLUS NUMBER" rule. Do you still have a problem?
3 - You don't say what the conflict actually is; you'll need to try to
read the output report. Find the section that reports on the potential
shift and the potential reduction, and tell us about that bit.
Evan
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