Respuesta :

9 + 7d = 16

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9 + 7 d = 16

1. we subtract 9 from the two sides

9 - 9 + 7 d = 16 -9

0 + 7 d = 7

2. We divide by 7 both sides

(7 d)/ 7 = 7/ /7

7/7= 1

d= 1

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Answer

9 + 7d = 16

7d= 16 - 9

d= 7/ 7= 1

d= 1