<|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
Given the numbers [20, 35, 7, 42], compute the target number using basic arithmetic operations. Show each step in your work in <think> </think>. Your task is to uniquely apply each number once. Return the final equation and result in <answer> </answer>. For example, if the result is 51, the equation might look like 42 * (35 - 20) - 7 = 51.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>