Answer:
Luis wrote an incorrect expression.
Step-by-step explanation:
As per Terrell, the correct expression is (2x+2x) + (5x+5x) + (1+1) which is equal to 12x + 2
For you who got incorrect answer, the answer if you simplified it must be 12x + 2. Let's check:
Anya   2x+2x+5x+1+5x+1 =
      12x + 2 [CORRECT]
Katrin   2(5x+1) + 2x
       10x+2+2x
       12x + 2 [CORRECT]
Luis    2(2x) + 2(5x+1)
       4x+10x+2
       14x + 2 [INCORRECT]
Steve   1+1+ x(2+2+5+5)
       2+ x(12)
       12x + 2 [CORRECT]