To solve the equation \( 4x - 3 = 3x - 9 \), we can start by isolating \( x \).
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Subtract \( 3x \) from both sides: \[ 4x - 3x - 3 = -9 \] This simplifies to: \[ x - 3 = -9 \]
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Next, add 3 to both sides: \[ x - 3 + 3 = -9 + 3 \] This simplifies to: \[ x = -6 \]
Thus, the solution is \( x = -6 \).
The answer is: B. x = -6.