<|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
Create an equation that equals 100 using the numbers [50, 20, 4, 1], with basic arithmetic operations (*, /, +, -). You can only use each number once and show your work in <think> </think> tags. Return the final equation and answer in <answer> </answer> tags, for example <answer> (20 * 5) - 20 = 80 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>