Answer
S = 26
Step-by-step explanation:
I know this because you would know what they both need to equal each other. Well you know you take 3 by the number, and subtract by 9 and it has to equal 69. You would do 69 + 9 = 78. Then divide by 3. 26. Then their you go. Hope this helps. Please comment back if it is correct or in correct. Please also rate this answer.