Answer:
It's 12.
Explanation:
Well if s x 7 = 84
than simply change the equation. s x 7 = 84
Divide 7 on both sides and you will get
s = 12
And if you want to check your work, just replace 12 with s.
or count by 12s 7 times, 12 , 24 , 36, 48, 60, 72, 84 <<