9x+10
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The number is 45. The sum of its digits i.e. 4+5=9 Five times the sum of its digits i.e. 5 times 9 which is 45
9(4+n)Nine times the sum of 4 and a number is an expression and can not be evaluated.
81 8+1=9 9*9=81
2(x + 9) = 2x + 18
9*n + 28 >= -20.