Q: 9a plus 15 equals 7a plus 9?

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9a-a = 19+7a 8a = 19+7a 8a - 7a = 19 + 7a - 7a 1a = 19 a = 19

It is: 9a-a-a = 7a

9a + 1

2a+5a+9a = 16a

7a

a = 6b = 9a + b = 6 + 9 = 15

It is: -7a when simplified

9a+21 3(3a+7)

12a + 6b + 9a + 14b =(12a + 9a) + (6b + 14b) =21a + 20b

-21 = 9a - 15 - 3a -6 = 6a -1 = a

-14 + 9a = 389a = 52a = 52/9 or 5.78

a= -0.8