Question 997175
x represents the number.


2 * (x - 7) = 9


divide both sides by 2 to get x - 7 = 4.5


add 7 to both sides to get x = 11.5


to confirm, test our the original assmption.


twice the difference of a number and 7 equals 9.


the number is 11.5
11.5 - 7 = 4.5
two times 4.5 = 9.


looks good.