Question 756792
Supplementary Angles add up to 180 degrees.
{{{x + y = 180}}}

The measure of an angle is fourteen times the measure of a supplementary angle.
{{{x = 14y}}}

Substitute 14y for x
{{{14y + y = 180}}}
{{{15y = 180}}}
{{{y = 12}}}

{{{x = 180-y = 180-12 = 168}}}