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To solve the equation, we can start by expanding the expression on the left side:
3(3x + 4) - 6x = -9
(9x + 12) - 6x = -9
Next, we can combine like terms:
9x - 6x + 12 = -9
3x + 12 = -9
Then, we can isolate the variable by subtracting 12 from both sides:
3x + 12 - 12 = -9 - 12
3x = -21
Finally, we divide both sides by 3 to solve for x:
3x/3 = -21/3
x = -7
Therefore, the solution to the equation is x = -7.