The given expression consists of four terms: 10x, 7x, 4x, and 3x. To simplify the expression, we can combine like terms by adding or subtracting them. In this case, all the terms have the variable x raised to the power of 1 and can be combined. Adding the coefficients of the like terms, we get 10 + 7 + 4 + 3 = 24. Therefore, the simplified expression is 24x.