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$\frac{x^{2}-c}{x-b}$<br/><br/>In the expression above, $b$ and $c$ are positive integers. If the expression is equivalent to $x+b$ and $x\neq b$, which of the following could be the value of $c$ ?<br/><br/>B. 6<br/><br/>C. 8<br/><br/>D. 10