Respuesta :

Step 1. Subtract 4x from both sides
8 = 7.2 + 5x - 4x
Step 2. Simplify 7.2 + 5x - 4x to 7.2 + x
8 = 7.2 + x
Step 3. Subtract 7.2 from both sides 
8 - 7.2 = x
Step 4. Simplify 8 - 7.2 to 0.8
0.8 = x
Step 5. Switch sides
Answer: x = 0.8