Question 972148
{{{x+y=180}}}


x and y are supplementary angles.
{{{highlight_green(x=-74.6+y)}}} or x is 74.6 degrees less than the supplementary angle.


{{{(y-76.4)+y=180}}}
{{{2y-74.6=180}}}
{{{2y=180+74.6}}}
y=127.3



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Look and read the problem description very carefully.  x is described, and the definition of supplementary angles is used.  A formula for x using the problem description was obtained.
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NOTE:  I fixed my mistake.