To solve the expression (20 - 15 + 10 - 5), we can follow the order of operations (left to right for addition and subtraction):

Step 1: Calculate (20 - 15)

(20 - 15 = 5)

Step 2: Add 10 to the result

(5 + 10 = 15)

Step 3: Subtract 5 from the result

(15 - 5 = 10)

Answer: (\boxed{10})

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