<|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 using all these numbers once. The provided numbers are [15, -20, 35, 8]. You can use basic arithmetic operations (+, -, *, /) to arrive at the target number (70). The numbers can appear in any order and each number has to be used once. Write your equation within <think> and </think> tags and present your final equation and result in <answer> and </answer> tags, as a response would ideally look like <answer> (15 + (-20)) * 35 + 8 = 70 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>