Choice A is the correct answer. Set $y=0$.

1. Substitute: $3x - 2(0) = 12 \rightarrow 3x = 12$.
2. Solve: $x = 4$.

💡 Strategic Tip: In Standard Form $Ax+By=C$, the x-intercept is $C/A$.

Choice B is incorrect because it is the y-intercept. Choice C is incorrect because sign error. Choice D is incorrect because calculation error.