<|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, 21, 35, 49], create an equation that equals 100. Utilize basic arithmetic operations (+, -, *, /) and ensure each number is used only once. Show your work in <think> </think> tags. And provide the final equation and result in <answer> </answer> tags, for example, <answer> (35 + 63) / 3 = 29 </answer>.<|im_end|>
<|im_start|>assistant
Let me solve this step by step.
<think>