2x plus 4 increased by 15 is 57 Take this algebraic expression in parts: 2x plus 4: 2x + 4 Increased by means we add 15 to 2x + 4: 2x + 4 + 15 = 2x + 19 The word is means an equation, so we set 2x + 19 equal to 57: Our final algebraic expression is: 2x + 19 = 57 To solve for x, we type this equation into our search engine and we get x = 19