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Multiply & divide rational expressions (advanced)


Multiply the following rational expressions and simplify the result.
start fraction, 12, y, plus, 8, y, z, divided by, y, start superscript, 4, end superscript, plus, 9, y, cubed, z, plus, 20, y, squared, z, squared, end fraction, dot, start fraction, y, squared, minus, 16, z, squared, divided by, 6, z, plus, 9, end fraction, equals