Question 27819
You're close, and you started fine.  But remember, x is <i>both</i> angle A & B, <b>not angle A <i>plus</i> angle B</b>.  So you have to add all three angles:
Angle A (x)
Angle B (x)
Angle C (x+60)
{{{x+x+(x+60)=180}}}
<b>not</b>{{{x+(x+60)=180}}}