Hello
Here we need to solve for n by separating it in one side and the other terms in the other side
-6n+21 =12n-15 add 6n to both sides
-6n+21+6n =12n-15+6n simplify and combine like terms
21 = 18n - 15 add 15 to both sides
21 + 15 = 18n - 15 + 15 combine like terms
36 = 18 n divide by 18
36/18 = 18n /18
n = 2DOne
I hope you got
the idea
