The following context-free grammar is ambiguous: in particular, the operations are not left- or right-associative. Also, the grammar does not not provide precendence of operations.

::= +

::= *

::= x

Add attributes and attribute rules to the grammar that make multiplication take precedence over addition. Dont make the grammar completely unambiguous; that is, dont make the operations left- or right-associative. Also, do not modify the original context-free grammar.