<|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 [18, 27, 56, 61], create an equation that equals 105. Use basic arithmetic operations (+, -, *, /) and ensure each number is used only once. Show your work in <think> </think> tags. Additionally, return the final equation and answer in <answer> </answer> tags, for example <answer>(27 + 56) * 18 - 44 = 105</answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>