Question

N-3-4n=21
( please solve)

Answer 1

remember, you can do anything to an equation as long as you do it to both sides

assuming N=n

1n-3-4n=21
1n-4n-3=21
-3n-3=21
add 3 to both sides
-3n=24
divide both sides by -3
n=-8

Answer 2

N- 3 - 4n = 21

-3n = 24

n = -8

hope this helps