<|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 [15, 25, 30, 20], create an equation that equals 50. You can use basic arithmetic operations (+, -, *, /) and each number can only be used once. Find at least two expressions to reach the target number. Show your work in <think> </think> tags. And return the final equations in <answer> </answer> tags, for example <answer> 15 + 25 = 40; 40 + 20 - 30 = 30 (not correct as it leads to 30); finally 15 + 30 = 45; 45 + 5 = 50 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>