There were a total of 800 novels and non-fiction books at a book shop. 2/5 of these books were novels. Each novel was priced at
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first off, let's split the triplet into two equations, then from there on we'll do substitution.
that of course, is only true if x + y, or our numerator doesn't turn into 0, if it does then our fraction becomes 0 and our equation goes south. Keeping in mind that x,y and z are numeric values that correlate like so.