<|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 [40, 20, -80, 50], create an equation that equals 150. You can use basic arithmetic operations (+, -, *, /) and each number can only be used once. Show your work in <think> </think> tags. And return your final equation and answer in a LaTeX equation format, for example \((20 + 40) * (50 - (-80)) = 150\).<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>