Question

4n+8=9n-7

Answer 1

15=5n
3=n

Answer 2

\[4n-9n=-7-8\]
\[5n=15\]
\[n=15/5=3\]

Answer 3

4n + 8 = 9n - 7

Subtracting 4n from both the sides

4n - 4n + 8 = 9n - 4n - 7

Cancelling out 4n and - 4n because 4n - 4n = 0

8 = 5n - 7 [ Combining like terms 9n - 4n = 5n]

Adding 7 to both the sides

8 + 7 = 5n - 7+ 7

15 = 5n , Now dividing 5 to both the sides to solve for n

15/5 = 5n/5

3 = n which is n = 3

I hope this will help you .

Thanks

Abhishek Sinha