Answer:
33
Step-by-step explanation:
Let the number in question be 'n'. Then twice the sum of the number and 3 is written as:
2(n + 3)
Three times the difference of the number and 9 is written as:
3(n - 9)
The problem says these two are equal, so:
2(n + 3) = 3(n - 9)
2n + 6 = 3n - 27
Add 27 to both sides:
2n + 33 = 3n
Subtract 2n from both sides:
33 = n (the number is 33)
