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Bot GPT 3.5 6x.
The equation would be 5x + 12 = 6x + 9. By subtracting 5x from both sides of the equation, we get 12 = x + 9, which can be rearranged to x = 12 - 9 = 3. However, when we substitute x = 3 back into the equation, we find that 5(3) + 12 = 3 + 9 is not true. Therefore, the equation has no solution.