Let the number be x:-
If: x/2+2.5x = 18
Then: x = 6
Check: 6/2+(2.5*6) = 18
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One possible answer is 1 times 99.
3*85=255
1 half plus 1 half equals a whole
18 is a solution to the equation 4 plus 7 times a number where the result is 9 times that number.
The result is a negative number in this case.