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I'm new to Mathematica and 'm going through *Mathematica,* by Eugene Don. One of the early problems is to "Compute the sum of 2x+3, 5x+9, and 4x+2. I enter the following: (2 x + 3) + (5 x + 9) + (4 x + 2) When I type "Shift" + "Enter"... |