Question

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-2a - 9= 6a +15

Answer 1

dont know if you already got the answer but

the solution is a=-3

Explanation:

Answer 2

a = -3

-2a - 9 = 6a + 15

put like terms near eachother

-2a - 6a = 9 + 15

combine

-8a = 24

divide by -8

a = -3