-1/2x + 3 = -x + 7
We're simply just trying to get "x" by itself.
So, in order to do this, we must move anything that doesn't have "x" in it to the other side.
SO, subtract 3 from both sides.
-1/2x = -x + 7 - 3
Then, add x to both sides.
-1/2x + x = 7 - 3
Then, simplify.
1/2x = 4
Multiply both sides by 2.
2 · 1/2x = 4 · 2
Simplify.
x = 8
~Hope I helped!~