the difference of x and y added to twice the sum of a and b

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the difference of x and y added to twice the sum of a and b

Take this algebraic expression in parts:

• The difference of x and y: x - y
• The sum of a and b: a + b
• Twice the sum of a and b means we multiply a + b by 2: 2(a + b)
  
• The phrase added to means we add:

x - y + 2(a + b)