**Lesson Steps**:

8 = 4 + x

Step 1: Move like variables to one side. Isolate x.

8 - 4 = x

Since we're moving 4, that was a positive number, to the other side, change it's sign to negative.

Step 2: Evaluate (8 - 4)

4 = x

Hence, we get x = 4.

**Answer**:

x = 4

**Grade**: 7

**Level**: Primary

**Subject**: Math

**Topic**: Algebra