Answer
$d \approx 0.667$
Work Step by Step
$3(d+4) - 14 = 0$
$3d + 12 - 14 = 0$
$3d - 2 = 0$
$3d = 2$
$d = \frac{2}{3}$
$d \approx 0.667$
Check:
$3(d+4) - 14 \overset{?}{=} 0$
$3((\frac{2}{3})+4) - 14 \overset{?}{=} 0$
$3(\frac{14}{3}) - 14 \overset{?}{=} 0$
$14 - 14 \overset{?}{=} 0$
$0 = 0$
