<|im_start|>system
You are a helpful assistant. You first thinks about the reasoning process in the mind and then provides the user with the answer.<|im_end|>
<|im_start|>user
Using the numbers [13, 15, 16, 9], create an equation that equals 85. You can use basic arithmetic operations (+, -, *, /) and each number can only be used once, including all of them. Show your work in <think> </think> tags. And return the final equation and answer in <answer> </answer> tags, for example <answer> 13 * 16 - 15 = 217 - 15 = 202 - 9 = 202 - 9 = 193 + 13 = 206 - 15 = 189 + 13 = 202 - 9 = 193 + 15 = 208 - 16 = 192 + 9 = 201 - 15 = 186 + 13 = 209 - 16 = 193 + 9 = 202 - 15 = 187 + 13 = 200 - 16 = 184 + 9 = 203 - 15 = 188 + 13 = 201 - 16 = 185 + 9 = 204 - 15 = 189 + 13 = 202 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>