



 
Hi Monejah, Solve it first with a specific value for $r,$ say $r = 7.$
You want to isolate $t$ on the left of the equality sign so you need to remove the term $12t$ from the right side. To do this add $12t$ to both sides of the equation to get \[8t  7  12t = 12t  12t\] simplifying gives \[4t  7 = 0\] Now add 7 to each side to get \[4 t = 7\] Finally multiply each side by $\large  \frac14$ to get \[ \frac14 \times 4 t =  \frac14 \times 7\] or \[t =  \frac74\] Now mimic these steps to solve $8t  r = 12t$ for $t.$ Penny  


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