S/7 = 14/12
12s = 98
s = 98/12
s = 49/6
Why? Well, if this relationship is proportional, that would mean while s = 14 and t = 12, the expression in which t = 7 would have to be proportional to the first. By doing 12s = 98, we find our numerator for what s is when t = 7. Then, since t already equals 12, we have our fraction: 98/12. We can now reduce that by dividing the numerator and denominator by 2 to get 49/6. Therefore, when t = 7, s = 49/6.
Your final answer: s = 49/6.