Question

12.2 - N =3.3 i need heeeeelpXD

Answer 1

Remember you can do ANTYHING to an equation as long asyou do it to both sides

12.2-N=3.3
minus 3.3 both sides
12.2-3.3-N=3.3-3.3
8.9-N=0
add N to both sides
8.9+N-N=0+N
8.9+0=N
8.9=N

Answer 2

If you do 12.2-3.3 youll get your answer