The sum of the given expression would depend on the values of the variables which have not been given.
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9 This expression can be simplified to: 9x
14x is the sum of 5x and 9x
18 + 8x + x = = 18 + 9x = 9(2 + x) which is the factored form of the expression.
9x^2 +6 +1 is (3x+1)(3x+1) when factored
9x+39