So the two angles will equal 180 degrees. The angle above 2x+5 is the same angle as x-5. And those two angles will equal a line (180 degrees). Add the two angles together to equal 180 degrees.
(x-5)+(2x+5)=180 3x+(-5)+5=180 the fives cancel each other out 3x=180 divide both sides by 3 x=60
