4/p+p/6-3p/2
"\\frac{4}{p}+\\frac{p}{6}-\\frac{3p}{2}\\\\"
"=\\frac{4\\times 6}{6p}+\\frac{p\\times p}{6\\times p}-\\frac{3p\\times 3p}{2\\times 3p}\\\\"
"=\\frac{24}{6p}+\\frac{p^2}{6p}-\\frac{9p^2}{6p}\\\\"
"=\\frac{24+p^2-9p^2}{6p}"
"=\\frac{24-8p^2}{6p}"
"=\\frac{8(3-p^2)}{6p}"
"=\\frac{4(3-p^2)}{3p}"
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