<|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 [7, 12, 89, 42], create an equation that equals 89. You can use basic arithmetic operations (+, -, *, /) and each number can only be used once. Demonstrate your solution in the format <think>your solution here</think> and present it with the <answer>your final equation and solution.</answer>. Make sure to show your reasoning in <think> </think> tags. Your solution presents your thoughts and calculations clearly.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>