The sum of a number and 9 Is -7

Question

please help me solve this equation using one step 

Answer 1

the underlying equation you could set up here is

x + 9 = -7 because the sum of the number and 9 is equal to -7

solving that for x algebraically yields

x = -7 - 9 = -16

Answer 2

number = n

 

n+ 9 =-7

 

n =-7 -9

 

n=-16