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\(5(a+2) - 6 \div a = \\ 5(a+2) - \left(\dfrac{6}{a}\right)\\\)

 

\(\left . 5(a+2)-\dfrac 6 a \right |_{a=3} = \\ 5(3+2) - \dfrac 6 3 = \\ 25 - 2 = \\ \Large 23\)

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 Nov 12, 2018

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