Using the numbers [17, 70, 52, 80], create an equation that equals 193. You can use basic arithmetic operations (+, -, *, /) and each number can only be used once. Show your work in <think> </think> tags. And return the final equation and answer in <answer> </answer> tags, for example <answer> 5 + 80 / (1 - 1/2) = 193 </answer>.