To isolate \(8x\) on the right side of the equation while keeping the equation balanced, you should subtract 9 from both sides of the equation.
Starting from your equation: \[ -3 = 8x + 9 \]
If you subtract 9 from both sides, you will get: \[ -3 - 9 = 8x + 9 - 9 \] This simplifies to: \[ -12 = 8x \]
Now \(8x\) is alone on the right side.