Answer :

Answer:

a = 9

Explanation:

5(a + 4) - 6a + 1 = 12

5a + 20 - 6a + 1 = 12

5a - 6a + 20 + 1 = 12

-1a + 21 = 12

     -21      -21

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-1a = -9

/-1     /-1

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a = 9

Answer:

a = 9

Explanation:

the steps are in the answer above me