If the sum of a number and nine is doubled, the result is seven less than the number. find the number.

X=the number we have to find.

This expression "2 (x+9) " is when the sum of a number and nine is doubled.

If the result is seven less than the number, we will have: x-7

We can suggest the following equation:

2 (x+9) = (x-7)

2x+18=x-7

2x-x=-7-18

x=-25

answer: the number would be: - 25.