2=9-n

a n = 7n

b n = 8n=

c n = 9n

N=7

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation:

2 - (9-n) = 0

Step by step solution:

Step 1 : Solving a Single Variable Equation:

Solve : n-7 = 0

Add 7 to both sides of the equation:

n = 7

One solution was found : n = 7