<|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 [12, 34, 75, 89], craft a mathematical equation that equals 156 using basic arithmetic operations ( +, -, *, / ). You can use each number only once in your calculation, and show your work in <think> </think> tags. Return your final equation and result in <answer> </answer> tags, like this: <answer> 2 * (89) = 178 </answer>. <|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>