20х-5(3+5х)+20

Let's simplify the expression step by step:

1. Start with the original expression: \[ 20x - 5(3 + 5x) + 20 \]

2. Distribute the \(-5\) into the parentheses: \[ 20x - 5 \cdot 3 - 5 \cdot 5x + 20 \] This results in: \[ 20x - 15 - 25x + 20 \]

3. Combine like terms:

   • Combine \(20x - 25x\): \[ 20x - 25x = -5x \]
   • Combine \(-15 + 20\): \[ -15 + 20 = 5 \]

4. Put it all together: \[ -5x + 5 \]

Thus, the simplified expression is: \[ -5x + 5 \]