Question 648243

as you already know, the sum of angles in triangle is {{{180}}}

so,  {{{G+H+I=180}}} 

if angle {{{H =2x+ 5}}} and angle {{{I=x-2}}}, then 

{{{G+(2x+ 5)+(x-2)=180}}} 

{{{G=180-2x-5-x+2}}} 

{{{G=180-3x-3}}} 

{{{G=177-3x}}}