[tex]a)\ \ 2\cdot7\pi =14\pi \\\\b)\ \ 5\cdot3\pi=15\pi \\\\c)\ \ 2\pi +5\pi =7\pi \\\\d)\ \ 9\pi -7\pi =2\pi \\\\e)\ \ 2\cdot5\pi +6\pi =10\pi +6\pi =16\pi \\\\f)\ \ 3\cdot7\pi -\pi =21\pi -\pi =20\pi[/tex]
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[tex]a)\ \ 2\cdot7\pi =14\pi \\\\b)\ \ 5\cdot3\pi=15\pi \\\\c)\ \ 2\pi +5\pi =7\pi \\\\d)\ \ 9\pi -7\pi =2\pi \\\\e)\ \ 2\cdot5\pi +6\pi =10\pi +6\pi =16\pi \\\\f)\ \ 3\cdot7\pi -\pi =21\pi -\pi =20\pi[/tex]