you can add, subtract, multiply, and divide things on both sides of the equation as long as you do the same thing to the other side so
if i add n to this side
1-n+n
i must add it to the other side
1-n+n= 7/12 +n
1=7/12 + n
now you must subtract the 7/12 from both sides
1 - 7/12= 7/12 - 7 /12 + n
5/12= n
hope this helps!
