Question 1143764
.
<pre>

The governing equation is


    {{{((75+80+70+65+92)+2x)/(5+2)}}} = 80.


Simplify and solve for x, which is the unknown value under the question.


    x = {{{(7*80 - (75 + 80 + 70 +65 +92))/2}}} = 89.    <U>ANSWER</U>
</pre>