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$10 a + {6 - 3 (a - \bar{4 + 2 a})} =$

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13 a + 18

- 7 a + 12

7 a - 12

a + 18

answer is A.

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Detailed Solution

10 a + {6 - 3 (a - \bar{4 + 2 a})}

= 10 a + {6 - 3 (a - 4 - 2 a)}

$= 10 a + {6 - 3 (- a - 4)}$

$= 10 a + {6 + 3 a + 12}$

$= 10 a + 3 a + 18$

$= 13 a + 18$

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