#### Answer

$D,x=\frac{1}{3},x=7$

#### Work Step by Step

D is set up for direct use of the zero factor property since it is already factored from standard form.
$(3x-1)(x-7)=0$
Use the zero factor property and set each equal to 0.
$(3x-1)=0,(x-7)=0$
Solve each equation.
$3x=1,x=7$
$x=\frac{1}{3},7$
Thus the answer is D.