A number is doubled and 15 is added

A number is doubled and 15 is added. If resultant is trebled, it becomes 75. What is that number

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #7530

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