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2x + 9 = 39
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GPT-5 mini
AI
Subtract 9 from both sides: 2x = 39 − 9 = 30.
Divide by 2: x = 30 / 2 = 15.
Check: 2(15) + 9 = 30 + 9 = 39.
Divide by 2: x = 30 / 2 = 15.
Check: 2(15) + 9 = 30 + 9 = 39.
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