Add & subtract rational expressions: unlike denominators

Problem

Giovanna and Pedro were each asked to perform the following operation:
start fraction, 5, divided by, 6, k, start superscript, 2, end superscript, end fraction, plus, start fraction, 2, k, plus, 2, divided by, 4, k, minus, 7, end fraction
Their answers are shown below:
GiovannaPedro
start fraction, 12, k, start superscript, 3, end superscript, plus, 12, k, start superscript, 2, end superscript, plus, 20, k, minus, 35, divided by, 24, k, start superscript, 3, end superscript, minus, 42, k, start superscript, 2, end superscript, end fractionstart fraction, 44, k, start superscript, 6, end superscript, minus, 35, divided by, minus, 18, k, end fraction
Is either of the students correct?
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