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Easy: Multiplying
Factor every numerator and denominator first. To multiply, multiply across and cancel factors that appear on the top and the bottom. To divide, multiply by the reciprocal of the second expression. The excluded values make any denominator zero, including the numerator of a divisor, since it ends up on the bottom.
Multiply or divide. Simplify, and state the excluded values.
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No. Factor everything first and cancel common factors across the tops and bottoms; multiplying out first makes the factors hard to see.
Multiply by the reciprocal of the second expression, then factor and cancel, just as with numeric fractions.
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