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The equation has one solution: x=3.
To solve for x, first distribute on both sides:
9x + 9 = 15x + 3 - 12
9x + 9 = 15x - 9
Next, move all the x terms to one side:
9 = 6x - 9
18 = 6x
x = 3
Therefore, the equation has one solution: x=3.