<|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 [20, 35, 49, 66], create an equation that equals 156. 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> 20 + 35 = 55, then 55 + 49 = 104, then 104 + 48 = 128, then 128 + 6 = 142, finally 142 + 1 = 156 </answer>. <|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>