The answer is: x = 400
Here's how I got my answer:
Step 1: Subtract .60 from both sides. Leave us with

Step 2: Simplify
to
. Which leaves us with

Step 3: Subtract 20 from both sides. Which leaves us with

Step 4: Simplify
to 80. Which leaves us with

Step 5: Divide both sides by 0.2. Which leaves us with

Step 6: Simplify
to 400. Which leaves us with our answer, x = 400