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Add & subtract rational expressions: like denominators

Problem

Subtract the following rational expressions.
start fraction, 7, y, squared, divided by, y, cubed, plus, 4, y, minus, 1, end fraction, minus, start fraction, minus, 2, y, squared, plus, 3, y, divided by, y, cubed, plus, 4, y, minus, 1, end fraction, equals
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