Question

find the value of a if : 2a + 9 = 57 - 6a​

Answer 1

$2a + 9 = 57 - 6a \\ 2a + 6a = 57 - 9 \\ 8a = 48 \\ a = 6$

Answer 2

2a + 9 = 57 - 6a

9 - 57 = -6a - 2a

-48 = -8a

a = 48/8

a = 6

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