Step 1. Expand
2 - a = a - 1.8
Step 2. Add a to both sides
2 = a - 1.8 + a
Step 3. Simplify a - 1.8 + a to 2a - 1.8
2 = 2a - 1.8
Step 4. Add 1.8 to both sides
2 + 1.8 = 2a
Step 5. Simplify 5 + 1.8 to 3.8
3.8 = 2a
Step 6. Divide both sides by 2
3.8/2 = a
Step 7. Simplify 3.8/2 to 1.9
1.9 = a
Step 8. Switch sides
a = 1.9
