Please write a full answer and give a good explanation!

Show BNF, EBNF or syntax diagrams for the language of expressions over the alphabet (x, +,G)). Parentheses must be balanced, + is a binary operation, and x is a variable name, which is the only allowed primitive expression. Dmi um strengi mlinu. Examples of strings in the language. xC)+x)+ xx Dmi um strengi ekki mlinu. Examples of strings not in the language. E (tmi strengurinn, the empty string) +x