Work Step by Step
$4+12a=-2(6-4a) \\\\ 4+12a=-12+8a \\\\ 4+4a=-12 \\\\ 4a=-16 \\\\ a=-4$ We first use the distributive property on the right side of the equation to simplify. We then subtract by 8a on both sides. Next, we subtract by 4 on both sides. Finally, we divide by 4 to get that $a=-4$.