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How can I provide a step-by-step guide to answering an algebraic function?

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How can I provide a step-by-step guide to answering an algebraic function?
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The (x-3)s cancel out because they will produce the same answer for all values of x.. . (x-5)/(5-x) produces an answer of -1 because they'll always be the opposite (negative) answer for all values of x.. . The answer is -1
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3x-11
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