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Simplify rational expressions (advanced)

Problem

Simplify the following rational expression and express in expanded form.
start fraction, y, start superscript, 4, end superscript, plus, 5, y, squared, plus, 6, divided by, 4, y, start superscript, 5, end superscript, plus, 12, y, cubed, end fraction, equals
Which real values of y make the expression undefined?
Choose all answers that apply:
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